Actual source code: petscsnes.h

  1: /*
  2:     User interface for the nonlinear solvers package.
  3: */
  4: #ifndef PETSCSNES_H
  5: #define PETSCSNES_H

  7: #include <petscksp.h>
  8: #include <petscdmtypes.h>
  9: #include <petscfvtypes.h>
 10: #include <petscdmdatypes.h>

 12: /* SUBMANSEC = SNES */

 14: /*S
 15:      SNES - Abstract PETSc object that manages all nonlinear solves

 17:    Level: beginner

 19: .seealso: [](chapter_snes), `SNESCreate()`, `SNESSetType()`, `SNESType`, `TS`, `SNES`, `KSP`, `PC`, `SNESDestroy()`
 20: S*/
 21: typedef struct _p_SNES *SNES;

 23: /*J
 24:     SNESType - String with the name of a PETSc SNES method.

 26:    Level: beginner

 28: .seealso: [](chapter_snes), `SNESSetType()`, `SNES`, `SNESCreate()`, `SNESDestroy()`, `SNESSetFromOptions()`
 29: J*/
 30: typedef const char *SNESType;
 31: #define SNESNEWTONLS         "newtonls"
 32: #define SNESNEWTONTR         "newtontr"
 33: #define SNESNEWTONTRDC       "newtontrdc"
 34: #define SNESPYTHON           "python"
 35: #define SNESNRICHARDSON      "nrichardson"
 36: #define SNESKSPONLY          "ksponly"
 37: #define SNESKSPTRANSPOSEONLY "ksptransposeonly"
 38: #define SNESVINEWTONRSLS     "vinewtonrsls"
 39: #define SNESVINEWTONSSLS     "vinewtonssls"
 40: #define SNESNGMRES           "ngmres"
 41: #define SNESQN               "qn"
 42: #define SNESSHELL            "shell"
 43: #define SNESNGS              "ngs"
 44: #define SNESNCG              "ncg"
 45: #define SNESFAS              "fas"
 46: #define SNESMS               "ms"
 47: #define SNESNASM             "nasm"
 48: #define SNESANDERSON         "anderson"
 49: #define SNESASPIN            "aspin"
 50: #define SNESCOMPOSITE        "composite"
 51: #define SNESPATCH            "patch"

 53: /* Logging support */
 54: PETSC_EXTERN PetscClassId SNES_CLASSID;
 55: PETSC_EXTERN PetscClassId DMSNES_CLASSID;

 57: PETSC_EXTERN PetscErrorCode SNESInitializePackage(void);

 59: PETSC_EXTERN PetscErrorCode SNESCreate(MPI_Comm, SNES *);
 60: PETSC_EXTERN PetscErrorCode SNESReset(SNES);
 61: PETSC_EXTERN PetscErrorCode SNESDestroy(SNES *);
 62: PETSC_EXTERN PetscErrorCode SNESSetType(SNES, SNESType);
 63: PETSC_EXTERN PetscErrorCode SNESMonitor(SNES, PetscInt, PetscReal);
 64: PETSC_EXTERN PetscErrorCode SNESMonitorSet(SNES, PetscErrorCode (*)(SNES, PetscInt, PetscReal, void *), void *, PetscErrorCode (*)(void **));
 65: PETSC_EXTERN PetscErrorCode SNESMonitorSetFromOptions(SNES, const char[], const char[], const char[], PetscErrorCode (*)(SNES, PetscInt, PetscReal, PetscViewerAndFormat *), PetscErrorCode (*)(SNES, PetscViewerAndFormat *));
 66: PETSC_EXTERN PetscErrorCode SNESMonitorCancel(SNES);
 67: PETSC_EXTERN PetscErrorCode SNESMonitorSAWs(SNES, PetscInt, PetscReal, void *);
 68: PETSC_EXTERN PetscErrorCode SNESMonitorSAWsCreate(SNES, void **);
 69: PETSC_EXTERN PetscErrorCode SNESMonitorSAWsDestroy(void **);
 70: PETSC_EXTERN PetscErrorCode SNESSetConvergenceHistory(SNES, PetscReal[], PetscInt[], PetscInt, PetscBool);
 71: PETSC_EXTERN PetscErrorCode SNESGetConvergenceHistory(SNES, PetscReal *[], PetscInt *[], PetscInt *);
 72: PETSC_EXTERN PetscErrorCode SNESSetUp(SNES);
 73: PETSC_EXTERN PetscErrorCode SNESSolve(SNES, Vec, Vec);
 74: PETSC_EXTERN PetscErrorCode SNESSetErrorIfNotConverged(SNES, PetscBool);
 75: PETSC_EXTERN PetscErrorCode SNESGetErrorIfNotConverged(SNES, PetscBool *);

 77: PETSC_EXTERN PetscErrorCode SNESSetWorkVecs(SNES, PetscInt);

 79: PETSC_EXTERN PetscErrorCode SNESAddOptionsChecker(PetscErrorCode (*)(SNES));

 81: PETSC_EXTERN PetscErrorCode SNESSetUpdate(SNES, PetscErrorCode (*)(SNES, PetscInt));

 83: PETSC_EXTERN PetscErrorCode SNESRegister(const char[], PetscErrorCode (*)(SNES));

 85: PETSC_EXTERN PetscErrorCode SNESGetKSP(SNES, KSP *);
 86: PETSC_EXTERN PetscErrorCode SNESSetKSP(SNES, KSP);
 87: PETSC_EXTERN PetscErrorCode SNESSetSolution(SNES, Vec);
 88: PETSC_EXTERN PetscErrorCode SNESGetSolution(SNES, Vec *);
 89: PETSC_EXTERN PetscErrorCode SNESGetSolutionUpdate(SNES, Vec *);
 90: PETSC_EXTERN PetscErrorCode SNESGetRhs(SNES, Vec *);
 91: PETSC_EXTERN PetscErrorCode SNESView(SNES, PetscViewer);
 92: PETSC_EXTERN PetscErrorCode SNESLoad(SNES, PetscViewer);
 93: PETSC_EXTERN PetscErrorCode SNESConvergedReasonViewSet(SNES, PetscErrorCode (*)(SNES, void *), void *, PetscErrorCode (*)(void **));
 94: PETSC_EXTERN PetscErrorCode SNESViewFromOptions(SNES, PetscObject, const char[]);
 95: PETSC_EXTERN PetscErrorCode SNESConvergedReasonView(SNES, PetscViewer);
 96: PETSC_EXTERN PetscErrorCode SNESConvergedReasonViewFromOptions(SNES);
 97: PETSC_EXTERN PetscErrorCode SNESConvergedReasonViewCancel(SNES);

 99: PETSC_DEPRECATED_FUNCTION("Use SNESConvergedReasonView() (since version 3.14)") static inline PetscErrorCode SNESReasonView(SNES snes, PetscViewer v)
100: {
101:   return SNESConvergedReasonView(snes, v);
102: }
103: PETSC_DEPRECATED_FUNCTION("Use SNESConvergedReasonViewFromOptions() (since version 3.14)") static inline PetscErrorCode SNESReasonViewFromOptions(SNES snes)
104: {
105:   return SNESConvergedReasonViewFromOptions(snes);
106: }

108: #define SNES_FILE_CLASSID 1211224

110: PETSC_EXTERN PetscErrorCode SNESSetOptionsPrefix(SNES, const char[]);
111: PETSC_EXTERN PetscErrorCode SNESAppendOptionsPrefix(SNES, const char[]);
112: PETSC_EXTERN PetscErrorCode SNESGetOptionsPrefix(SNES, const char *[]);
113: PETSC_EXTERN PetscErrorCode SNESSetFromOptions(SNES);
114: PETSC_EXTERN PetscErrorCode SNESResetFromOptions(SNES);

116: PETSC_EXTERN PetscErrorCode SNESSetUseMatrixFree(SNES, PetscBool, PetscBool);
117: PETSC_EXTERN PetscErrorCode SNESGetUseMatrixFree(SNES, PetscBool *, PetscBool *);
118: PETSC_EXTERN PetscErrorCode MatCreateSNESMF(SNES, Mat *);
119: PETSC_EXTERN PetscErrorCode MatSNESMFGetSNES(Mat, SNES *);
120: PETSC_EXTERN PetscErrorCode MatSNESMFSetReuseBase(Mat, PetscBool);
121: PETSC_EXTERN PetscErrorCode MatSNESMFGetReuseBase(Mat, PetscBool *);
122: PETSC_EXTERN PetscErrorCode MatMFFDComputeJacobian(SNES, Vec, Mat, Mat, void *);
123: PETSC_EXTERN PetscErrorCode MatCreateSNESMFMore(SNES, Vec, Mat *);
124: PETSC_EXTERN PetscErrorCode MatSNESMFMoreSetParameters(Mat, PetscReal, PetscReal, PetscReal);

126: PETSC_EXTERN PetscErrorCode SNESGetType(SNES, SNESType *);
127: PETSC_EXTERN PetscErrorCode SNESMonitorDefaultSetUp(SNES, PetscViewerAndFormat *);
128: PETSC_EXTERN PetscErrorCode SNESMonitorDefault(SNES, PetscInt, PetscReal, PetscViewerAndFormat *);
129: PETSC_EXTERN PetscErrorCode SNESMonitorScaling(SNES, PetscInt, PetscReal, PetscViewerAndFormat *);
130: PETSC_EXTERN PetscErrorCode SNESMonitorRange(SNES, PetscInt, PetscReal, PetscViewerAndFormat *);
131: PETSC_EXTERN PetscErrorCode SNESMonitorRatio(SNES, PetscInt, PetscReal, PetscViewerAndFormat *);
132: PETSC_EXTERN PetscErrorCode SNESMonitorRatioSetUp(SNES, PetscViewerAndFormat *);
133: PETSC_EXTERN PetscErrorCode SNESMonitorSolution(SNES, PetscInt, PetscReal, PetscViewerAndFormat *);
134: PETSC_EXTERN PetscErrorCode SNESMonitorResidual(SNES, PetscInt, PetscReal, PetscViewerAndFormat *);
135: PETSC_EXTERN PetscErrorCode SNESMonitorSolutionUpdate(SNES, PetscInt, PetscReal, PetscViewerAndFormat *);
136: PETSC_EXTERN PetscErrorCode SNESMonitorDefaultShort(SNES, PetscInt, PetscReal, PetscViewerAndFormat *);
137: PETSC_EXTERN PetscErrorCode SNESMonitorDefaultField(SNES, PetscInt, PetscReal, PetscViewerAndFormat *);
138: PETSC_EXTERN PetscErrorCode SNESMonitorJacUpdateSpectrum(SNES, PetscInt, PetscReal, PetscViewerAndFormat *);
139: PETSC_EXTERN PetscErrorCode SNESMonitorFields(SNES, PetscInt, PetscReal, PetscViewerAndFormat *);
140: PETSC_EXTERN PetscErrorCode KSPMonitorSNESResidual(KSP, PetscInt, PetscReal, PetscViewerAndFormat *);
141: PETSC_EXTERN PetscErrorCode KSPMonitorSNESResidualDrawLG(KSP, PetscInt, PetscReal, PetscViewerAndFormat *);
142: PETSC_EXTERN PetscErrorCode KSPMonitorSNESResidualDrawLGCreate(PetscViewer, PetscViewerFormat, void *, PetscViewerAndFormat **);

144: PETSC_EXTERN PetscErrorCode SNESSetTolerances(SNES, PetscReal, PetscReal, PetscReal, PetscInt, PetscInt);
145: PETSC_EXTERN PetscErrorCode SNESSetDivergenceTolerance(SNES, PetscReal);
146: PETSC_EXTERN PetscErrorCode SNESGetTolerances(SNES, PetscReal *, PetscReal *, PetscReal *, PetscInt *, PetscInt *);
147: PETSC_EXTERN PetscErrorCode SNESGetDivergenceTolerance(SNES, PetscReal *);
148: PETSC_EXTERN PetscErrorCode SNESSetTrustRegionTolerance(SNES, PetscReal);
149: PETSC_EXTERN PetscErrorCode SNESGetForceIteration(SNES, PetscBool *);
150: PETSC_EXTERN PetscErrorCode SNESSetForceIteration(SNES, PetscBool);
151: PETSC_EXTERN PetscErrorCode SNESGetIterationNumber(SNES, PetscInt *);
152: PETSC_EXTERN PetscErrorCode SNESSetIterationNumber(SNES, PetscInt);

154: PETSC_EXTERN PetscErrorCode SNESNewtonTRSetPreCheck(SNES, PetscErrorCode (*)(SNES, Vec, Vec, PetscBool *, void *), void *ctx);
155: PETSC_EXTERN PetscErrorCode SNESNewtonTRGetPreCheck(SNES, PetscErrorCode (**)(SNES, Vec, Vec, PetscBool *, void *), void **ctx);
156: PETSC_EXTERN PetscErrorCode SNESNewtonTRSetPostCheck(SNES, PetscErrorCode (*)(SNES, Vec, Vec, Vec, PetscBool *, PetscBool *, void *), void *ctx);
157: PETSC_EXTERN PetscErrorCode SNESNewtonTRGetPostCheck(SNES, PetscErrorCode (**)(SNES, Vec, Vec, Vec, PetscBool *, PetscBool *, void *), void **ctx);

159: PETSC_EXTERN PetscErrorCode SNESNewtonTRDCGetRhoFlag(SNES, PetscBool *);
160: PETSC_EXTERN PetscErrorCode SNESNewtonTRDCSetPreCheck(SNES, PetscErrorCode (*)(SNES, Vec, Vec, PetscBool *, void *), void *ctx);
161: PETSC_EXTERN PetscErrorCode SNESNewtonTRDCGetPreCheck(SNES, PetscErrorCode (**)(SNES, Vec, Vec, PetscBool *, void *), void **ctx);
162: PETSC_EXTERN PetscErrorCode SNESNewtonTRDCSetPostCheck(SNES, PetscErrorCode (*)(SNES, Vec, Vec, Vec, PetscBool *, PetscBool *, void *), void *ctx);
163: PETSC_EXTERN PetscErrorCode SNESNewtonTRDCGetPostCheck(SNES, PetscErrorCode (**)(SNES, Vec, Vec, Vec, PetscBool *, PetscBool *, void *), void **ctx);

165: PETSC_EXTERN PetscErrorCode SNESGetNonlinearStepFailures(SNES, PetscInt *);
166: PETSC_EXTERN PetscErrorCode SNESSetMaxNonlinearStepFailures(SNES, PetscInt);
167: PETSC_EXTERN PetscErrorCode SNESGetMaxNonlinearStepFailures(SNES, PetscInt *);
168: PETSC_EXTERN PetscErrorCode SNESGetNumberFunctionEvals(SNES, PetscInt *);

170: PETSC_EXTERN PetscErrorCode SNESSetLagPreconditioner(SNES, PetscInt);
171: PETSC_EXTERN PetscErrorCode SNESGetLagPreconditioner(SNES, PetscInt *);
172: PETSC_EXTERN PetscErrorCode SNESSetLagJacobian(SNES, PetscInt);
173: PETSC_EXTERN PetscErrorCode SNESGetLagJacobian(SNES, PetscInt *);
174: PETSC_EXTERN PetscErrorCode SNESSetLagPreconditionerPersists(SNES, PetscBool);
175: PETSC_EXTERN PetscErrorCode SNESSetLagJacobianPersists(SNES, PetscBool);
176: PETSC_EXTERN PetscErrorCode SNESSetGridSequence(SNES, PetscInt);
177: PETSC_EXTERN PetscErrorCode SNESGetGridSequence(SNES, PetscInt *);

179: PETSC_EXTERN PetscErrorCode SNESGetLinearSolveIterations(SNES, PetscInt *);
180: PETSC_EXTERN PetscErrorCode SNESGetLinearSolveFailures(SNES, PetscInt *);
181: PETSC_EXTERN PetscErrorCode SNESSetMaxLinearSolveFailures(SNES, PetscInt);
182: PETSC_EXTERN PetscErrorCode SNESGetMaxLinearSolveFailures(SNES, PetscInt *);
183: PETSC_EXTERN PetscErrorCode SNESSetCountersReset(SNES, PetscBool);

185: PETSC_EXTERN PetscErrorCode SNESKSPSetUseEW(SNES, PetscBool);
186: PETSC_EXTERN PetscErrorCode SNESKSPGetUseEW(SNES, PetscBool *);
187: PETSC_EXTERN PetscErrorCode SNESKSPSetParametersEW(SNES, PetscInt, PetscReal, PetscReal, PetscReal, PetscReal, PetscReal, PetscReal);
188: PETSC_EXTERN PetscErrorCode SNESKSPGetParametersEW(SNES, PetscInt *, PetscReal *, PetscReal *, PetscReal *, PetscReal *, PetscReal *, PetscReal *);

190: #include <petscdrawtypes.h>
191: PETSC_EXTERN PetscErrorCode SNESMonitorLGRange(SNES, PetscInt, PetscReal, void *);

193: PETSC_EXTERN PetscErrorCode SNESSetApplicationContext(SNES, void *);
194: PETSC_EXTERN PetscErrorCode SNESGetApplicationContext(SNES, void *);
195: PETSC_EXTERN PetscErrorCode SNESSetComputeApplicationContext(SNES, PetscErrorCode (*)(SNES, void **), PetscErrorCode (*)(void **));

197: PETSC_EXTERN PetscErrorCode SNESPythonSetType(SNES, const char[]);
198: PETSC_EXTERN PetscErrorCode SNESPythonGetType(SNES, const char *[]);

200: PETSC_EXTERN PetscErrorCode SNESSetFunctionDomainError(SNES);
201: PETSC_EXTERN PetscErrorCode SNESGetFunctionDomainError(SNES, PetscBool *);
202: PETSC_EXTERN PetscErrorCode SNESGetJacobianDomainError(SNES, PetscBool *);
203: PETSC_EXTERN PetscErrorCode SNESSetJacobianDomainError(SNES);
204: PETSC_EXTERN PetscErrorCode SNESSetCheckJacobianDomainError(SNES, PetscBool);
205: PETSC_EXTERN PetscErrorCode SNESGetCheckJacobianDomainError(SNES, PetscBool *);

207: #define SNES_CONVERGED_TR_DELTA_DEPRECATED SNES_CONVERGED_TR_DELTA PETSC_DEPRECATED_ENUM("Use SNES_DIVERGED_TR_DELTA (since version 3.12)")
208: /*E
209:     SNESConvergedReason - reason a `SNESSolve()` was determined to have converged or diverged

211:    Level: beginner

213:    Values:
214: +  `SNES_CONVERGED_FNORM_ABS` - 2-norm(F) <= abstol
215: .  `SNES_CONVERGED_FNORM_RELATIVE` - 2-norm(F) <= rtol*2-norm(F(x_0)) where x_0 is the initial guess
216: .  `SNES_CONVERGED_SNORM_RELATIVE` - The 2-norm of the last step <= stol * 2-norm(x) where x is the current
217: .  `SNES_DIVERGED_FUNCTION_COUNT` - The user provided function has been called more times than the maximum set in `SNESSetTolerances()`
218: .  `SNES_DIVERGED_DTOL` - The norm of the function has increased by a factor of divtol set with `SNESSetDivergenceTolerance()`
219: .  `SNES_DIVERGED_FNORM_NAN` - the 2-norm of the current function evaluation is not-a-number (NaN), this
220:       is usually caused by a division of 0 by 0.
221: .  `SNES_DIVERGED_MAX_IT` - `SNESSolve()` has reached the maximum number of iterations requested
222: .  `SNES_DIVERGED_LINE_SEARCH` - The line search has failed. This only occurs for `SNES` solvers that use a line search
223: .  `SNES_DIVERGED_LOCAL_MIN` - the algorithm seems to have stagnated at a local minimum that is not zero.
224: -  `SNES_CONERGED_ITERATING` - this only occurs if `SNESGetConvergedReason()` is called during the `SNESSolve()`

226:     Notes:
227:    The two most common reasons for divergence are an incorrectly coded or computed Jacobian or failure or lack of convergence in the linear system (in this case we recommend
228:    testing with `-pc_type lu` to eliminate the linear solver as the cause of the problem).

230:    `SNES_DIVERGED_LOCAL_MIN` can only occur when using the line-search variant of `SNES`.
231:        The line search wants to minimize Q(alpha) = 1/2 || F(x + alpha s) ||^2_2  this occurs
232:        at Q'(alpha) = s^T F'(x+alpha s)^T F(x+alpha s) = 0. If s is the Newton direction - F'(x)^(-1)F(x) then
233:        you get Q'(alpha) = -F(x)^T F'(x)^(-1)^T F'(x+alpha s)F(x+alpha s); when alpha = 0
234:        Q'(0) = - ||F(x)||^2_2 which is always NEGATIVE if F'(x) is invertible. This means the Newton
235:        direction is a descent direction and the line search should succeed if alpha is small enough.

237:        If F'(x) is NOT invertible AND F'(x)^T F(x) = 0 then Q'(0) = 0 and the Newton direction
238:        is NOT a descent direction so the line search will fail. All one can do at this point
239:        is change the initial guess and try again.

241:        An alternative explanation: Newton's method can be regarded as replacing the function with
242:        its linear approximation and minimizing the 2-norm of that. That is F(x+s) approx F(x) + F'(x)s
243:        so we minimize || F(x) + F'(x) s ||^2_2; do this using Least Squares. If F'(x) is invertible then
244:        s = - F'(x)^(-1)F(x) otherwise F'(x)^T F'(x) s = -F'(x)^T F(x). If F'(x)^T F(x) is NOT zero then there
245:        exists a nontrivial (that is F'(x)s != 0) solution to the equation and this direction is
246:        s = - [F'(x)^T F'(x)]^(-1) F'(x)^T F(x) so Q'(0) = - F(x)^T F'(x) [F'(x)^T F'(x)]^(-T) F'(x)^T F(x)
247:        = - (F'(x)^T F(x)) [F'(x)^T F'(x)]^(-T) (F'(x)^T F(x)). Since we are assuming (F'(x)^T F(x)) != 0
248:        and F'(x)^T F'(x) has no negative eigenvalues Q'(0) < 0 so s is a descent direction and the line
249:        search should succeed for small enough alpha.

251:        Note that this RARELY happens in practice. Far more likely the linear system is not being solved
252:        (well enough?) or the Jacobian is wrong.

254:    `SNES_DIVERGED_MAX_IT` means that the solver reached the maximum number of iterations without satisfying any
255:    convergence criteria. `SNES_CONVERGED_ITS` means that `SNESConvergedSkip()` was chosen as the convergence test;
256:    thus the usual convergence criteria have not been checked and may or may not be satisfied.

258: .seealso: [](chapter_snes), `SNES`, `SNESSolve()`, `SNESGetConvergedReason()`, `KSPConvergedReason`, `SNESSetConvergenceTest()`, `SNESSetTolerances()`
259: E*/
260: typedef enum {                       /* converged */
261:   SNES_CONVERGED_FNORM_ABS      = 2, /* ||F|| < atol */
262:   SNES_CONVERGED_FNORM_RELATIVE = 3, /* ||F|| < rtol*||F_initial|| */
263:   SNES_CONVERGED_SNORM_RELATIVE = 4, /* Newton computed step size small; || delta x || < stol || x ||*/
264:   SNES_CONVERGED_ITS            = 5, /* maximum iterations reached */
265:   SNES_BREAKOUT_INNER_ITER      = 6, /* Flag to break out of inner loop after checking custom convergence. */
266:                                      /* it is used in multi-phase flow when state changes */
267:   /* diverged */
268:   SNES_DIVERGED_FUNCTION_DOMAIN      = -1, /* the new x location passed the function is not in the domain of F */
269:   SNES_DIVERGED_FUNCTION_COUNT       = -2,
270:   SNES_DIVERGED_LINEAR_SOLVE         = -3, /* the linear solve failed */
271:   SNES_DIVERGED_FNORM_NAN            = -4,
272:   SNES_DIVERGED_MAX_IT               = -5,
273:   SNES_DIVERGED_LINE_SEARCH          = -6,  /* the line search failed */
274:   SNES_DIVERGED_INNER                = -7,  /* inner solve failed */
275:   SNES_DIVERGED_LOCAL_MIN            = -8,  /* || J^T b || is small, implies converged to local minimum of F() */
276:   SNES_DIVERGED_DTOL                 = -9,  /* || F || > divtol*||F_initial|| */
277:   SNES_DIVERGED_JACOBIAN_DOMAIN      = -10, /* Jacobian calculation does not make sense */
278:   SNES_DIVERGED_TR_DELTA             = -11,
279:   SNES_CONVERGED_TR_DELTA_DEPRECATED = -11,

281:   SNES_CONVERGED_ITERATING = 0
282: } SNESConvergedReason;
283: PETSC_EXTERN const char *const *SNESConvergedReasons;

285: /*MC
286:      SNES_CONVERGED_FNORM_ABS - 2-norm(F) <= abstol

288:    Level: beginner

290: .seealso: [](chapter_snes), `SNES`, `SNESSolve()`, `SNESGetConvergedReason()`, `SNESConvergedReason`, `SNESSetTolerances()`
291: M*/

293: /*MC
294:      SNES_CONVERGED_FNORM_RELATIVE - 2-norm(F) <= rtol*2-norm(F(x_0)) where x_0 is the initial guess

296:    Level: beginner

298: .seealso: [](chapter_snes), `SNES`, `SNESSolve()`, `SNESGetConvergedReason()`, `SNESConvergedReason`, `SNESSetTolerances()`
299: M*/

301: /*MC
302:      SNES_CONVERGED_SNORM_RELATIVE - The 2-norm of the last step <= stol * 2-norm(x) where x is the current
303:           solution and stol is the 4th argument to `SNESSetTolerances()`

305:      Options Database Keys:
306:       -snes_stol <stol> - the step tolerance

308:    Level: beginner

310: .seealso: [](chapter_snes), `SNES`, `SNESSolve()`, `SNESGetConvergedReason()`, `SNESConvergedReason`, `SNESSetTolerances()`
311: M*/

313: /*MC
314:      SNES_DIVERGED_FUNCTION_COUNT - The user provided function has been called more times then the final
315:          argument to `SNESSetTolerances()`

317:    Level: beginner

319: .seealso: [](chapter_snes), `SNES`, `SNESSolve()`, `SNESGetConvergedReason()`, `SNESConvergedReason`, `SNESSetTolerances()`
320: M*/

322: /*MC
323:      SNES_DIVERGED_DTOL - The norm of the function has increased by a factor of divtol set with `SNESSetDivergenceTolerance()`

325:    Level: beginner

327: .seealso: [](chapter_snes), `SNES`, `SNESSolve()`, `SNESGetConvergedReason()`, `SNESConvergedReason`, `SNESSetTolerances()`, `SNESSetDivergenceTolerance()`
328: M*/

330: /*MC
331:      SNES_DIVERGED_FNORM_NAN - the 2-norm of the current function evaluation is not-a-number (NaN), this
332:       is usually caused by a division of 0 by 0.

334:    Level: beginner

336: .seealso: [](chapter_snes), `SNES`, `SNESSolve()`, `SNESGetConvergedReason()`, `SNESConvergedReason`, `SNESSetTolerances()`
337: M*/

339: /*MC
340:      SNES_DIVERGED_MAX_IT - SNESSolve() has reached the maximum number of iterations requested

342:    Level: beginner

344: .seealso: [](chapter_snes), `SNES`, `SNESSolve()`, `SNESGetConvergedReason()`, `SNESConvergedReason`, `SNESSetTolerances()`
345: M*/

347: /*MC
348:      SNES_DIVERGED_LINE_SEARCH - The line search has failed. This only occurs for a `SNES` solvers that use a line search

350:    Level: beginner

352: .seealso: [](chapter_snes), `SNES`, `SNESSolve()`, `SNESGetConvergedReason()`, `SNESConvergedReason`, `SNESSetTolerances()`, `SNESLineSearch`
353: M*/

355: /*MC
356:      SNES_DIVERGED_LOCAL_MIN - the algorithm seems to have stagnated at a local minimum that is not zero.
357:         See the manual page for `SNESConvergedReason` for more details

359:    Level: beginner

361: .seealso: [](chapter_snes), `SNES`, `SNESSolve()`, `SNESGetConvergedReason()`, `SNESConvergedReason`, `SNESSetTolerances()`
362: M*/

364: /*MC
365:      SNES_CONERGED_ITERATING - this only occurs if `SNESGetConvergedReason()` is called during the `SNESSolve()`

367:    Level: beginner

369: .seealso: [](chapter_snes), `SNES`, `SNESSolve()`, `SNESGetConvergedReason()`, `SNESConvergedReason`, `SNESSetTolerances()`
370: M*/

372: PETSC_EXTERN PetscErrorCode SNESSetConvergenceTest(SNES, PetscErrorCode (*)(SNES, PetscInt, PetscReal, PetscReal, PetscReal, SNESConvergedReason *, void *), void *, PetscErrorCode (*)(void *));
373: PETSC_EXTERN PetscErrorCode SNESConvergedDefault(SNES, PetscInt, PetscReal, PetscReal, PetscReal, SNESConvergedReason *, void *);
374: PETSC_EXTERN PetscErrorCode SNESConvergedSkip(SNES, PetscInt, PetscReal, PetscReal, PetscReal, SNESConvergedReason *, void *);
375: PETSC_EXTERN PetscErrorCode SNESConvergedCorrectPressure(SNES, PetscInt, PetscReal, PetscReal, PetscReal, SNESConvergedReason *, void *);
376: PETSC_EXTERN PetscErrorCode SNESGetConvergedReason(SNES, SNESConvergedReason *);
377: PETSC_EXTERN PetscErrorCode SNESGetConvergedReasonString(SNES, const char **);
378: PETSC_EXTERN PetscErrorCode SNESSetConvergedReason(SNES, SNESConvergedReason);

380: PETSC_DEPRECATED_FUNCTION("Use SNESConvergedSkip() (since version 3.5)") static inline void SNESSkipConverged(void)
381: { /* never called */
382: }
383: #define SNESSkipConverged (SNESSkipConverged, SNESConvergedSkip)

385: /* --------- Solving systems of nonlinear equations --------------- */
386: PETSC_EXTERN PetscErrorCode SNESSetFunction(SNES, Vec, PetscErrorCode (*)(SNES, Vec, Vec, void *), void *);
387: PETSC_EXTERN PetscErrorCode SNESGetFunction(SNES, Vec *, PetscErrorCode (**)(SNES, Vec, Vec, void *), void **);
388: PETSC_EXTERN PetscErrorCode SNESComputeFunction(SNES, Vec, Vec);
389: PETSC_EXTERN PetscErrorCode SNESComputeMFFunction(SNES, Vec, Vec);
390: PETSC_EXTERN PetscErrorCode SNESSetInitialFunction(SNES, Vec);

392: PETSC_EXTERN PetscErrorCode SNESSetJacobian(SNES, Mat, Mat, PetscErrorCode (*)(SNES, Vec, Mat, Mat, void *), void *);
393: PETSC_EXTERN PetscErrorCode SNESGetJacobian(SNES, Mat *, Mat *, PetscErrorCode (**)(SNES, Vec, Mat, Mat, void *), void **);
394: PETSC_EXTERN PetscErrorCode SNESObjectiveComputeFunctionDefaultFD(SNES, Vec, Vec, void *);
395: PETSC_EXTERN PetscErrorCode SNESComputeJacobianDefault(SNES, Vec, Mat, Mat, void *);
396: PETSC_EXTERN PetscErrorCode SNESComputeJacobianDefaultColor(SNES, Vec, Mat, Mat, void *);
397: PETSC_EXTERN PetscErrorCode SNESPruneJacobianColor(SNES, Mat, Mat);
398: PETSC_EXTERN PetscErrorCode SNESSetComputeInitialGuess(SNES, PetscErrorCode (*)(SNES, Vec, void *), void *);
399: PETSC_EXTERN PetscErrorCode SNESSetPicard(SNES, Vec, PetscErrorCode (*)(SNES, Vec, Vec, void *), Mat, Mat, PetscErrorCode (*)(SNES, Vec, Mat, Mat, void *), void *);
400: PETSC_EXTERN PetscErrorCode SNESGetPicard(SNES, Vec *, PetscErrorCode (**)(SNES, Vec, Vec, void *), Mat *, Mat *, PetscErrorCode (**)(SNES, Vec, Mat, Mat, void *), void **);
401: PETSC_EXTERN PetscErrorCode SNESPicardComputeFunction(SNES, Vec, Vec, void *);
402: PETSC_EXTERN PetscErrorCode SNESPicardComputeMFFunction(SNES, Vec, Vec, void *);
403: PETSC_EXTERN PetscErrorCode SNESPicardComputeJacobian(SNES, Vec, Mat, Mat, void *);

405: PETSC_EXTERN PetscErrorCode SNESSetObjective(SNES, PetscErrorCode (*)(SNES, Vec, PetscReal *, void *), void *);
406: PETSC_EXTERN PetscErrorCode SNESGetObjective(SNES, PetscErrorCode (**)(SNES, Vec, PetscReal *, void *), void **);
407: PETSC_EXTERN PetscErrorCode SNESComputeObjective(SNES, Vec, PetscReal *);

409: /*E
410:     SNESNormSchedule - Frequency with which the norm is computed

412:    Level: advanced

414:    Values:
415: +   `SNES_NORM_DEFAULT` - use the default behavior for the current `SNESType`
416: .   `SNES_NORM_NONE` - avoid all norm computations
417: .   `SNES_NORM_ALWAYS` - compute the norms whenever possible
418: .   `SNES_NORM_INITIAL_ONLY` - compute the norm only when the algorithm starts
419: .   `SNES_NORM_FINAL_ONLY` - compute the norm only when the algorithm finishes
420: -   `SNES_NORM_INITIAL_FINAL_ONLY` - compute the norm at the start and end of the algorithm

422:    Notes:
423:    Support for these is highly dependent on the solver.

425:    Some options limit the convergence tests that can be used.

427:    The `SNES_NORM_NONE` option is most commonly used when the nonlinear solver is being used as a smoother, for example for `SNESFAS`

429:    This is primarily used to turn off extra norm and function computation
430:    when the solvers are composed.

432: .seealso: [](chapter_snes), `SNES`, `SNESSolve()`, `SNESGetConvergedReason()`, `KSPSetNormType()`,
433:           `KSPSetConvergenceTest()`, `KSPSetPCSide()`
434: E*/
435: typedef enum {
436:   SNES_NORM_DEFAULT            = -1,
437:   SNES_NORM_NONE               = 0,
438:   SNES_NORM_ALWAYS             = 1,
439:   SNES_NORM_INITIAL_ONLY       = 2,
440:   SNES_NORM_FINAL_ONLY         = 3,
441:   SNES_NORM_INITIAL_FINAL_ONLY = 4
442: } SNESNormSchedule;
443: PETSC_EXTERN const char *const *const SNESNormSchedules;

445: /*MC
446:     SNES_NORM_NONE - Don't compute function and its L2 norm.

448:    Level: advanced

450:     Note:
451:     This is most useful for stationary solvers with a fixed number of iterations used as smoothers.

453: .seealso: [](chapter_snes), `SNESNormSchedule`, `SNES`, `SNESSetNormSchedule()`, `SNES_NORM_DEFAULT`
454: M*/

456: /*MC
457:     SNES_NORM_ALWAYS - Compute the function and its L2 norm at each iteration.

459:    Level: advanced

461:     Note:
462:     Most solvers will use this no matter what norm type is passed to them.

464: .seealso: [](chapter_snes), `SNESNormSchedule`, `SNES`, `SNESSetNormSchedule()`, `SNES_NORM_NONE`
465: M*/

467: /*MC
468:     SNES_NORM_INITIAL_ONLY - Compute the function and its L2 at iteration 0, but do not update it.

470:    Level: advanced

472:    Notes:
473:    This method is useful in composed methods, when a true solution might actually be found before `SNESSolve()` is called.
474:    This option enables the solve to abort on the zeroth iteration if this is the case.

476:    For solvers that require the computation of the L2 norm of the function as part of the method, this merely cancels
477:    the norm computation at the last iteration (if possible).

479: .seealso: [](chapter_snes), `SNESNormSchedule`, `SNES`, `SNESSetNormSchedule()`, `SNES_NORM_FINAL_ONLY`, `SNES_NORM_INITIAL_FINAL_ONLY`
480: M*/

482: /*MC
483:     SNES_NORM_FINAL_ONLY - Compute the function and its L2 norm on only the final iteration.

485:    Level: advanced

487:    Note:
488:    For solvers that require the computation of the L2 norm of the function as part of the method, behaves
489:    exactly as `SNES_NORM_DEFAULT`.  This method is useful when the function is gotten after `SNESSolve()` and
490:    used in subsequent computation for methods that do not need the norm computed during the rest of the
491:    solution procedure.

493: .seealso: [](chapter_snes), `SNESNormSchedule`, `SNES`, `SNESSetNormSchedule()`, `SNES_NORM_INITIAL_ONLY`, `SNES_NORM_INITIAL_FINAL_ONLY`
494: M*/

496: /*MC
497:     SNES_NORM_INITIAL_FINAL_ONLY - Compute the function and its L2 norm on only the initial and final iterations.

499:    Level: advanced

501:    Note:
502:    This method combines the benefits of `SNES_NORM_INITIAL_ONLY` and `SNES_NORM_FINAL_ONLY`.

504: .seealso: [](chapter_snes), `SNESNormSchedule`, `SNES`, `SNESSetNormSchedule()`, `SNES_NORM_SNES_NORM_INITIAL_ONLY`, `SNES_NORM_FINAL_ONLY`
505: M*/

507: PETSC_EXTERN PetscErrorCode SNESSetNormSchedule(SNES, SNESNormSchedule);
508: PETSC_EXTERN PetscErrorCode SNESGetNormSchedule(SNES, SNESNormSchedule *);
509: PETSC_EXTERN PetscErrorCode SNESSetFunctionNorm(SNES, PetscReal);
510: PETSC_EXTERN PetscErrorCode SNESGetFunctionNorm(SNES, PetscReal *);
511: PETSC_EXTERN PetscErrorCode SNESGetUpdateNorm(SNES, PetscReal *);
512: PETSC_EXTERN PetscErrorCode SNESGetSolutionNorm(SNES, PetscReal *);

514: /*E
515:     SNESFunctionType - Type of function computed

517:    Level: advanced

519:    Values:
520: +  `SNES_FUNCTION_DEFAULT` - the default behavior for the current `SNESType`
521: .  `SNES_FUNCTION_UNPRECONDITIONED` - the original function provided
522: -  `SNES_FUNCTION_PRECONDITIONED` - the modification of the function by the preconditioner

524:    Note:
525:    Support for these is dependent on the solver.

527: .seealso: [](chapter_snes), `SNES`, `SNESSolve()`, `SNESGetConvergedReason()`, `KSPSetNormType()`,
528:           `KSPSetConvergenceTest()`, `KSPSetPCSide()`
529: E*/
530: typedef enum {
531:   SNES_FUNCTION_DEFAULT          = -1,
532:   SNES_FUNCTION_UNPRECONDITIONED = 0,
533:   SNES_FUNCTION_PRECONDITIONED   = 1
534: } SNESFunctionType;
535: PETSC_EXTERN const char *const *const SNESFunctionTypes;

537: PETSC_EXTERN PetscErrorCode SNESSetFunctionType(SNES, SNESFunctionType);
538: PETSC_EXTERN PetscErrorCode SNESGetFunctionType(SNES, SNESFunctionType *);

540: PETSC_EXTERN PetscErrorCode SNESSetNGS(SNES, PetscErrorCode (*)(SNES, Vec, Vec, void *), void *);
541: PETSC_EXTERN PetscErrorCode SNESGetNGS(SNES, PetscErrorCode (**)(SNES, Vec, Vec, void *), void **);
542: PETSC_EXTERN PetscErrorCode SNESComputeNGS(SNES, Vec, Vec);

544: PETSC_EXTERN PetscErrorCode SNESNGSSetSweeps(SNES, PetscInt);
545: PETSC_EXTERN PetscErrorCode SNESNGSGetSweeps(SNES, PetscInt *);
546: PETSC_EXTERN PetscErrorCode SNESNGSSetTolerances(SNES, PetscReal, PetscReal, PetscReal, PetscInt);
547: PETSC_EXTERN PetscErrorCode SNESNGSGetTolerances(SNES, PetscReal *, PetscReal *, PetscReal *, PetscInt *);

549: PETSC_EXTERN PetscErrorCode SNESSetAlwaysComputesFinalResidual(SNES, PetscBool);
550: PETSC_EXTERN PetscErrorCode SNESGetAlwaysComputesFinalResidual(SNES, PetscBool *);

552: PETSC_EXTERN PetscErrorCode SNESShellGetContext(SNES, void *);
553: PETSC_EXTERN PetscErrorCode SNESShellSetContext(SNES, void *);
554: PETSC_EXTERN PetscErrorCode SNESShellSetSolve(SNES, PetscErrorCode (*)(SNES, Vec));

556: /* --------- Routines specifically for line search methods --------------- */

558: /*S
559:      SNESLineSearch - Abstract PETSc object that manages line-search operations for nonlinear solvers

561:    Level: beginner

563: .seealso: [](chapter_snes), `SNESLineSearchType`, `SNESLineSearchCreate()`, `SNESLineSearchSetType()`, `SNES`
564: S*/
565: typedef struct _p_LineSearch *SNESLineSearch;

567: /*J
568:     SNESLineSearchType - String with the name of a PETSc line search method `SNESLineSearch`

570:    Level: beginner

572: .seealso: [](chapter_snes), `SNESLineSearch`, `SNESLineSearchSetType()`, `SNES`
573: J*/
574: typedef const char *SNESLineSearchType;
575: #define SNESLINESEARCHBT        "bt"
576: #define SNESLINESEARCHNLEQERR   "nleqerr"
577: #define SNESLINESEARCHBASIC     "basic"
578: #define SNESLINESEARCHNONE      "none"
579: #define SNESLINESEARCHL2        "l2"
580: #define SNESLINESEARCHCP        "cp"
581: #define SNESLINESEARCHSHELL     "shell"
582: #define SNESLINESEARCHNCGLINEAR "ncglinear"

584: PETSC_EXTERN PetscFunctionList SNESList;
585: PETSC_EXTERN PetscClassId      SNESLINESEARCH_CLASSID;
586: PETSC_EXTERN PetscFunctionList SNESLineSearchList;

588: #define SNES_LINESEARCH_ORDER_LINEAR    1
589: #define SNES_LINESEARCH_ORDER_QUADRATIC 2
590: #define SNES_LINESEARCH_ORDER_CUBIC     3

592: PETSC_EXTERN_TYPEDEF typedef PetscErrorCode (*SNESLineSearchVIProjectFunc)(SNES, Vec);
593: PETSC_EXTERN_TYPEDEF typedef PetscErrorCode (*SNESLineSearchVINormFunc)(SNES, Vec, Vec, PetscReal *);
594: PETSC_EXTERN_TYPEDEF typedef PetscErrorCode (*SNESLineSearchApplyFunc)(SNESLineSearch);
595: PETSC_EXTERN_TYPEDEF typedef PetscErrorCode (*SNESLineSearchUserFunc)(SNESLineSearch, void *);

597: PETSC_EXTERN PetscErrorCode SNESLineSearchCreate(MPI_Comm, SNESLineSearch *);
598: PETSC_EXTERN PetscErrorCode SNESLineSearchReset(SNESLineSearch);
599: PETSC_EXTERN PetscErrorCode SNESLineSearchView(SNESLineSearch, PetscViewer);
600: PETSC_EXTERN PetscErrorCode SNESLineSearchDestroy(SNESLineSearch *);
601: PETSC_EXTERN PetscErrorCode SNESLineSearchGetType(SNESLineSearch, SNESLineSearchType *);
602: PETSC_EXTERN PetscErrorCode SNESLineSearchSetType(SNESLineSearch, SNESLineSearchType);
603: PETSC_EXTERN PetscErrorCode SNESLineSearchSetFromOptions(SNESLineSearch);
604: PETSC_EXTERN PetscErrorCode SNESLineSearchSetFunction(SNESLineSearch, PetscErrorCode (*)(SNES, Vec, Vec));
605: PETSC_EXTERN PetscErrorCode SNESLineSearchSetUp(SNESLineSearch);
606: PETSC_EXTERN PetscErrorCode SNESLineSearchApply(SNESLineSearch, Vec, Vec, PetscReal *, Vec);
607: PETSC_EXTERN PetscErrorCode SNESLineSearchPreCheck(SNESLineSearch, Vec, Vec, PetscBool *);
608: PETSC_EXTERN PetscErrorCode SNESLineSearchPostCheck(SNESLineSearch, Vec, Vec, Vec, PetscBool *, PetscBool *);
609: PETSC_EXTERN PetscErrorCode SNESLineSearchSetWorkVecs(SNESLineSearch, PetscInt);

611: /* set the functions for precheck and postcheck */

613: PETSC_EXTERN PetscErrorCode SNESLineSearchSetPreCheck(SNESLineSearch, PetscErrorCode (*)(SNESLineSearch, Vec, Vec, PetscBool *, void *), void *ctx);
614: PETSC_EXTERN PetscErrorCode SNESLineSearchSetPostCheck(SNESLineSearch, PetscErrorCode (*)(SNESLineSearch, Vec, Vec, Vec, PetscBool *, PetscBool *, void *), void *ctx);

616: PETSC_EXTERN PetscErrorCode SNESLineSearchGetPreCheck(SNESLineSearch, PetscErrorCode (**)(SNESLineSearch, Vec, Vec, PetscBool *, void *), void **ctx);
617: PETSC_EXTERN PetscErrorCode SNESLineSearchGetPostCheck(SNESLineSearch, PetscErrorCode (**)(SNESLineSearch, Vec, Vec, Vec, PetscBool *, PetscBool *, void *), void **ctx);

619: /* set the functions for VI-specific line search operations */

621: PETSC_EXTERN PetscErrorCode SNESLineSearchSetVIFunctions(SNESLineSearch, SNESLineSearchVIProjectFunc, SNESLineSearchVINormFunc);
622: PETSC_EXTERN PetscErrorCode SNESLineSearchGetVIFunctions(SNESLineSearch, SNESLineSearchVIProjectFunc *, SNESLineSearchVINormFunc *);

624: /* pointers to the associated SNES in order to be able to get the function evaluation out */
625: PETSC_EXTERN PetscErrorCode SNESLineSearchSetSNES(SNESLineSearch, SNES);
626: PETSC_EXTERN PetscErrorCode SNESLineSearchGetSNES(SNESLineSearch, SNES *);

628: /* set and get the parameters and vectors */
629: PETSC_EXTERN PetscErrorCode SNESLineSearchGetTolerances(SNESLineSearch, PetscReal *, PetscReal *, PetscReal *, PetscReal *, PetscReal *, PetscInt *);
630: PETSC_EXTERN PetscErrorCode SNESLineSearchSetTolerances(SNESLineSearch, PetscReal, PetscReal, PetscReal, PetscReal, PetscReal, PetscInt);

632: PETSC_EXTERN PetscErrorCode SNESLineSearchPreCheckPicard(SNESLineSearch, Vec, Vec, PetscBool *, void *);

634: PETSC_EXTERN PetscErrorCode SNESLineSearchGetLambda(SNESLineSearch, PetscReal *);
635: PETSC_EXTERN PetscErrorCode SNESLineSearchSetLambda(SNESLineSearch, PetscReal);

637: PETSC_EXTERN PetscErrorCode SNESLineSearchGetDamping(SNESLineSearch, PetscReal *);
638: PETSC_EXTERN PetscErrorCode SNESLineSearchSetDamping(SNESLineSearch, PetscReal);

640: PETSC_EXTERN PetscErrorCode SNESLineSearchGetOrder(SNESLineSearch, PetscInt *order);
641: PETSC_EXTERN PetscErrorCode SNESLineSearchSetOrder(SNESLineSearch, PetscInt order);

643: /*E
644:     SNESLineSearchReason - indication if the line search has succeeded or failed and why

646:    Level: intermediate

648:   Values:
649: +  `SNES_LINESEARCH_SUCCEEDED` - the line search succeeded
650: .  `SNES_LINESEARCH_FAILED_NANORINF` - a not a number of infinity appeared in the computions
651: .  `SNES_LINESEARCH_FAILED_DOMAIN` - the function was evaluated outside of its domain, see `SNESSetFunctionDomainError()` and `SNESSetJacobianDomainError()`
652: .  `SNES_LINESEARCH_FAILED_REDUCT` - the linear search failed to get the requested decrease in its norm or objective
653: .  `SNES_LINESEARCH_FAILED_USER` - used by `SNESLINESEARCHNLEQERR` to indicate the user changed the search direction inappropriately
654: -  `SNES_LINESEARCH_FAILED_FUNCTION` - indicates the maximum number of function evaluations allowed has been surpassed, `SNESConvergedReason` is also
655:                                      set to `SNES_DIVERGED_FUNCTION_COUNT`

657:    Developer Note:
658:    Some of these reasons overlap with values of `SNESConvergedReason`

660: .seealso: [](chapter_snes), `SNES`, `SNESSolve()`, `SNESGetConvergedReason()`, `KSPConvergedReason`, `SNESSetConvergenceTest()`,
661:           `SNESSetFunctionDomainError()` and `SNESSetJacobianDomainError()`
662: E*/
663: typedef enum {
664:   SNES_LINESEARCH_SUCCEEDED,
665:   SNES_LINESEARCH_FAILED_NANORINF,
666:   SNES_LINESEARCH_FAILED_DOMAIN,
667:   SNES_LINESEARCH_FAILED_REDUCT, /* INSUFFICIENT REDUCTION */
668:   SNES_LINESEARCH_FAILED_USER,
669:   SNES_LINESEARCH_FAILED_FUNCTION
670: } SNESLineSearchReason;

672: PETSC_EXTERN PetscErrorCode SNESLineSearchGetReason(SNESLineSearch, SNESLineSearchReason *);
673: PETSC_EXTERN PetscErrorCode SNESLineSearchSetReason(SNESLineSearch, SNESLineSearchReason);

675: PETSC_EXTERN PetscErrorCode SNESLineSearchGetVecs(SNESLineSearch, Vec *, Vec *, Vec *, Vec *, Vec *);
676: PETSC_EXTERN PetscErrorCode SNESLineSearchSetVecs(SNESLineSearch, Vec, Vec, Vec, Vec, Vec);

678: PETSC_EXTERN PetscErrorCode SNESLineSearchGetNorms(SNESLineSearch, PetscReal *, PetscReal *, PetscReal *);
679: PETSC_EXTERN PetscErrorCode SNESLineSearchSetNorms(SNESLineSearch, PetscReal, PetscReal, PetscReal);
680: PETSC_EXTERN PetscErrorCode SNESLineSearchComputeNorms(SNESLineSearch);
681: PETSC_EXTERN PetscErrorCode SNESLineSearchSetComputeNorms(SNESLineSearch, PetscBool);

683: PETSC_EXTERN PetscErrorCode SNESLineSearchMonitor(SNESLineSearch);
684: PETSC_EXTERN PetscErrorCode SNESLineSearchMonitorSet(SNESLineSearch, PetscErrorCode (*)(SNESLineSearch, void *), void *, PetscErrorCode (*)(void **));
685: PETSC_EXTERN PetscErrorCode SNESLineSearchMonitorSetFromOptions(SNESLineSearch, const char[], const char[], const char[], PetscErrorCode (*)(SNESLineSearch, PetscViewerAndFormat *), PetscErrorCode (*)(SNESLineSearch, PetscViewerAndFormat *));
686: PETSC_EXTERN PetscErrorCode SNESLineSearchMonitorCancel(SNESLineSearch);
687: PETSC_EXTERN PetscErrorCode SNESLineSearchMonitorUpdate(SNESLineSearch, PetscViewerAndFormat *);
688: PETSC_EXTERN PetscErrorCode SNESLineSearchSetDefaultMonitor(SNESLineSearch, PetscViewer);
689: PETSC_EXTERN PetscErrorCode SNESLineSearchGetDefaultMonitor(SNESLineSearch, PetscViewer *);
690: PETSC_EXTERN PetscErrorCode SNESLineSearchMonitorSolutionUpdate(SNESLineSearch, PetscViewerAndFormat *);

692: PETSC_EXTERN PetscErrorCode SNESLineSearchAppendOptionsPrefix(SNESLineSearch, const char prefix[]);
693: PETSC_EXTERN PetscErrorCode SNESLineSearchGetOptionsPrefix(SNESLineSearch, const char *prefix[]);

695: /* Shell interface functions */
696: PETSC_EXTERN PetscErrorCode SNESLineSearchShellSetUserFunc(SNESLineSearch, SNESLineSearchUserFunc, void *);
697: PETSC_EXTERN PetscErrorCode SNESLineSearchShellGetUserFunc(SNESLineSearch, SNESLineSearchUserFunc *, void **);

699: /* BT interface functions */
700: PETSC_EXTERN PetscErrorCode SNESLineSearchBTSetAlpha(SNESLineSearch, PetscReal);
701: PETSC_EXTERN PetscErrorCode SNESLineSearchBTGetAlpha(SNESLineSearch, PetscReal *);

703: /*register line search types */
704: PETSC_EXTERN PetscErrorCode SNESLineSearchRegister(const char[], PetscErrorCode (*)(SNESLineSearch));

706: /* Routines for VI solver */
707: PETSC_EXTERN PetscErrorCode SNESVISetVariableBounds(SNES, Vec, Vec);
708: PETSC_EXTERN PetscErrorCode SNESVIGetVariableBounds(SNES, Vec *, Vec *);
709: PETSC_EXTERN PetscErrorCode SNESVISetComputeVariableBounds(SNES, PetscErrorCode (*)(SNES, Vec, Vec));
710: PETSC_EXTERN PetscErrorCode SNESVIGetInactiveSet(SNES, IS *);
711: PETSC_EXTERN PetscErrorCode SNESVIGetActiveSetIS(SNES, Vec, Vec, IS *);
712: PETSC_EXTERN PetscErrorCode SNESVIComputeInactiveSetFnorm(SNES, Vec, Vec, PetscReal *);
713: PETSC_EXTERN PetscErrorCode SNESVISetRedundancyCheck(SNES, PetscErrorCode (*)(SNES, IS, IS *, void *), void *);
714: PETSC_EXTERN PetscErrorCode SNESVIComputeMeritFunction(Vec, PetscReal *, PetscReal *);
715: PETSC_EXTERN PetscErrorCode SNESVIComputeFunction(SNES, Vec, Vec, void *);
716: PETSC_EXTERN PetscErrorCode DMSetVI(DM, IS);
717: PETSC_EXTERN PetscErrorCode DMDestroyVI(DM);

719: PETSC_EXTERN PetscErrorCode SNESTestLocalMin(SNES);

721: /* Should this routine be private? */
722: PETSC_EXTERN PetscErrorCode SNESComputeJacobian(SNES, Vec, Mat, Mat);
723: PETSC_EXTERN PetscErrorCode SNESTestJacobian(SNES);

725: PETSC_EXTERN PetscErrorCode SNESSetDM(SNES, DM);
726: PETSC_EXTERN PetscErrorCode SNESGetDM(SNES, DM *);
727: PETSC_EXTERN PetscErrorCode SNESSetNPC(SNES, SNES);
728: PETSC_EXTERN PetscErrorCode SNESGetNPC(SNES, SNES *);
729: PETSC_EXTERN PetscErrorCode SNESHasNPC(SNES, PetscBool *);
730: PETSC_EXTERN PetscErrorCode SNESApplyNPC(SNES, Vec, Vec, Vec);
731: PETSC_EXTERN PetscErrorCode SNESGetNPCFunction(SNES, Vec, PetscReal *);
732: PETSC_EXTERN PetscErrorCode SNESComputeFunctionDefaultNPC(SNES, Vec, Vec);
733: PETSC_EXTERN PetscErrorCode SNESSetNPCSide(SNES, PCSide);
734: PETSC_EXTERN PetscErrorCode SNESGetNPCSide(SNES, PCSide *);
735: PETSC_EXTERN PetscErrorCode SNESSetLineSearch(SNES, SNESLineSearch);
736: PETSC_EXTERN PetscErrorCode SNESGetLineSearch(SNES, SNESLineSearch *);
737: PETSC_EXTERN PetscErrorCode SNESRestrictHookAdd(SNES, PetscErrorCode (*)(SNES, SNES, void *), void *);

739: PETSC_DEPRECATED_FUNCTION("Use SNESGetLineSearch() (since version 3.4)") static inline PetscErrorCode SNESGetSNESLineSearch(SNES snes, SNESLineSearch *ls)
740: {
741:   return SNESGetLineSearch(snes, ls);
742: }
743: PETSC_DEPRECATED_FUNCTION("Use SNESSetLineSearch() (since version 3.4)") static inline PetscErrorCode SNESSetSNESLineSearch(SNES snes, SNESLineSearch ls)
744: {
745:   return SNESSetLineSearch(snes, ls);
746: }

748: PETSC_EXTERN PetscErrorCode SNESSetUpMatrices(SNES);
749: PETSC_EXTERN PetscErrorCode DMSNESSetFunction(DM, PetscErrorCode (*)(SNES, Vec, Vec, void *), void *);
750: PETSC_EXTERN PetscErrorCode DMSNESGetFunction(DM, PetscErrorCode (**)(SNES, Vec, Vec, void *), void **);
751: PETSC_EXTERN PetscErrorCode DMSNESSetFunctionContextDestroy(DM, PetscErrorCode (*)(void *));
752: PETSC_EXTERN PetscErrorCode DMSNESSetMFFunction(DM, PetscErrorCode (*)(SNES, Vec, Vec, void *), void *);
753: PETSC_EXTERN PetscErrorCode DMSNESSetNGS(DM, PetscErrorCode (*)(SNES, Vec, Vec, void *), void *);
754: PETSC_EXTERN PetscErrorCode DMSNESGetNGS(DM, PetscErrorCode (**)(SNES, Vec, Vec, void *), void **);
755: PETSC_EXTERN PetscErrorCode DMSNESSetJacobian(DM, PetscErrorCode (*)(SNES, Vec, Mat, Mat, void *), void *);
756: PETSC_EXTERN PetscErrorCode DMSNESGetJacobian(DM, PetscErrorCode (**)(SNES, Vec, Mat, Mat, void *), void **);
757: PETSC_EXTERN PetscErrorCode DMSNESSetJacobianContextDestroy(DM, PetscErrorCode (*)(void *));
758: PETSC_EXTERN PetscErrorCode DMSNESSetPicard(DM, PetscErrorCode (*)(SNES, Vec, Vec, void *), PetscErrorCode (*)(SNES, Vec, Mat, Mat, void *), void *);
759: PETSC_EXTERN PetscErrorCode DMSNESGetPicard(DM, PetscErrorCode (**)(SNES, Vec, Vec, void *), PetscErrorCode (**)(SNES, Vec, Mat, Mat, void *), void **);
760: PETSC_EXTERN PetscErrorCode DMSNESSetObjective(DM, PetscErrorCode (*)(SNES, Vec, PetscReal *, void *), void *);
761: PETSC_EXTERN PetscErrorCode DMSNESGetObjective(DM, PetscErrorCode (**)(SNES, Vec, PetscReal *, void *), void **);
762: PETSC_EXTERN PetscErrorCode DMCopyDMSNES(DM, DM);

764: PETSC_EXTERN_TYPEDEF typedef PetscErrorCode (*DMDASNESFunction)(DMDALocalInfo *, void *, void *, void *);
765: PETSC_EXTERN_TYPEDEF typedef PetscErrorCode (*DMDASNESJacobian)(DMDALocalInfo *, void *, Mat, Mat, void *);
766: PETSC_EXTERN_TYPEDEF typedef PetscErrorCode (*DMDASNESObjective)(DMDALocalInfo *, void *, PetscReal *, void *);

768: PETSC_EXTERN_TYPEDEF typedef PetscErrorCode (*DMDASNESFunctionVec)(DMDALocalInfo *, Vec, Vec, void *);
769: PETSC_EXTERN_TYPEDEF typedef PetscErrorCode (*DMDASNESJacobianVec)(DMDALocalInfo *, Vec, Mat, Mat, void *);
770: PETSC_EXTERN_TYPEDEF typedef PetscErrorCode (*DMDASNESObjectiveVec)(DMDALocalInfo *, Vec, PetscReal *, void *);

772: PETSC_EXTERN PetscErrorCode DMDASNESSetFunctionLocal(DM, InsertMode, DMDASNESFunction, void *);
773: PETSC_EXTERN PetscErrorCode DMDASNESSetJacobianLocal(DM, DMDASNESJacobian, void *);
774: PETSC_EXTERN PetscErrorCode DMDASNESSetObjectiveLocal(DM, DMDASNESObjective, void *);
775: PETSC_EXTERN PetscErrorCode DMDASNESSetPicardLocal(DM, InsertMode, PetscErrorCode (*)(DMDALocalInfo *, void *, void *, void *), PetscErrorCode (*)(DMDALocalInfo *, void *, Mat, Mat, void *), void *);

777: PETSC_EXTERN PetscErrorCode DMDASNESSetFunctionLocalVec(DM, InsertMode, DMDASNESFunctionVec, void *);
778: PETSC_EXTERN PetscErrorCode DMDASNESSetJacobianLocalVec(DM, DMDASNESJacobianVec, void *);
779: PETSC_EXTERN PetscErrorCode DMDASNESSetObjectiveLocalVec(DM, DMDASNESObjectiveVec, void *);

781: PETSC_EXTERN PetscErrorCode DMSNESSetBoundaryLocal(DM, PetscErrorCode (*)(DM, Vec, void *), void *);
782: PETSC_EXTERN PetscErrorCode DMSNESSetFunctionLocal(DM, PetscErrorCode (*)(DM, Vec, Vec, void *), void *);
783: PETSC_EXTERN PetscErrorCode DMSNESSetJacobianLocal(DM, PetscErrorCode (*)(DM, Vec, Mat, Mat, void *), void *);
784: PETSC_EXTERN PetscErrorCode DMSNESGetBoundaryLocal(DM, PetscErrorCode (**)(DM, Vec, void *), void **);
785: PETSC_EXTERN PetscErrorCode DMSNESGetFunctionLocal(DM, PetscErrorCode (**)(DM, Vec, Vec, void *), void **);
786: PETSC_EXTERN PetscErrorCode DMSNESGetJacobianLocal(DM, PetscErrorCode (**)(DM, Vec, Mat, Mat, void *), void **);

788: /* Routines for Multiblock solver */
789: PETSC_EXTERN PetscErrorCode SNESMultiblockSetFields(SNES, const char[], PetscInt, const PetscInt *);
790: PETSC_EXTERN PetscErrorCode SNESMultiblockSetIS(SNES, const char[], IS);
791: PETSC_EXTERN PetscErrorCode SNESMultiblockSetBlockSize(SNES, PetscInt);
792: PETSC_EXTERN PetscErrorCode SNESMultiblockSetType(SNES, PCCompositeType);

794: /*J
795:     SNESMSType - String with the name of a PETSc `SNESMS` method.

797:    Level: intermediate

799: .seealso: [](chapter_snes), `SNESMS`, `SNESMSGetType()`, `SNESMSSetType()`, `SNES`
800: J*/
801: typedef const char *SNESMSType;
802: #define SNESMSM62       "m62"
803: #define SNESMSEULER     "euler"
804: #define SNESMSJAMESON83 "jameson83"
805: #define SNESMSVLTP11    "vltp11"
806: #define SNESMSVLTP21    "vltp21"
807: #define SNESMSVLTP31    "vltp31"
808: #define SNESMSVLTP41    "vltp41"
809: #define SNESMSVLTP51    "vltp51"
810: #define SNESMSVLTP61    "vltp61"

812: PETSC_EXTERN PetscErrorCode SNESMSRegister(SNESMSType, PetscInt, PetscInt, PetscReal, const PetscReal[], const PetscReal[], const PetscReal[]);
813: PETSC_EXTERN PetscErrorCode SNESMSGetType(SNES, SNESMSType *);
814: PETSC_EXTERN PetscErrorCode SNESMSSetType(SNES, SNESMSType);
815: PETSC_EXTERN PetscErrorCode SNESMSGetDamping(SNES, PetscReal *);
816: PETSC_EXTERN PetscErrorCode SNESMSSetDamping(SNES, PetscReal);
817: PETSC_EXTERN PetscErrorCode SNESMSFinalizePackage(void);
818: PETSC_EXTERN PetscErrorCode SNESMSInitializePackage(void);
819: PETSC_EXTERN PetscErrorCode SNESMSRegisterDestroy(void);

821: /* routines for NGMRES solver */

823: typedef enum {
824:   SNES_NGMRES_RESTART_NONE       = 0,
825:   SNES_NGMRES_RESTART_PERIODIC   = 1,
826:   SNES_NGMRES_RESTART_DIFFERENCE = 2
827: } SNESNGMRESRestartType;
828: PETSC_EXTERN const char *const SNESNGMRESRestartTypes[];

830: typedef enum {
831:   SNES_NGMRES_SELECT_NONE       = 0,
832:   SNES_NGMRES_SELECT_DIFFERENCE = 1,
833:   SNES_NGMRES_SELECT_LINESEARCH = 2
834: } SNESNGMRESSelectType;
835: PETSC_EXTERN const char *const SNESNGMRESSelectTypes[];

837: PETSC_EXTERN PetscErrorCode SNESNGMRESSetRestartType(SNES, SNESNGMRESRestartType);
838: PETSC_EXTERN PetscErrorCode SNESNGMRESSetSelectType(SNES, SNESNGMRESSelectType);
839: PETSC_EXTERN PetscErrorCode SNESNGMRESSetRestartFmRise(SNES, PetscBool);
840: PETSC_EXTERN PetscErrorCode SNESNGMRESGetRestartFmRise(SNES, PetscBool *);

842: /* routines for NCG solver */

844: typedef enum {
845:   SNES_NCG_FR  = 0,
846:   SNES_NCG_PRP = 1,
847:   SNES_NCG_HS  = 2,
848:   SNES_NCG_DY  = 3,
849:   SNES_NCG_CD  = 4
850: } SNESNCGType;
851: PETSC_EXTERN const char *const SNESNCGTypes[];

853: PETSC_EXTERN PetscErrorCode SNESNCGSetType(SNES, SNESNCGType);

855: typedef enum {
856:   SNES_QN_SCALE_DEFAULT  = 0,
857:   SNES_QN_SCALE_NONE     = 1,
858:   SNES_QN_SCALE_SCALAR   = 2,
859:   SNES_QN_SCALE_DIAGONAL = 3,
860:   SNES_QN_SCALE_JACOBIAN = 4
861: } SNESQNScaleType;
862: PETSC_EXTERN const char *const SNESQNScaleTypes[];
863: typedef enum {
864:   SNES_QN_RESTART_DEFAULT  = 0,
865:   SNES_QN_RESTART_NONE     = 1,
866:   SNES_QN_RESTART_POWELL   = 2,
867:   SNES_QN_RESTART_PERIODIC = 3
868: } SNESQNRestartType;
869: PETSC_EXTERN const char *const SNESQNRestartTypes[];
870: typedef enum {
871:   SNES_QN_LBFGS      = 0,
872:   SNES_QN_BROYDEN    = 1,
873:   SNES_QN_BADBROYDEN = 2
874: } SNESQNType;
875: PETSC_EXTERN const char *const SNESQNTypes[];

877: PETSC_EXTERN PetscErrorCode SNESQNSetType(SNES, SNESQNType);
878: PETSC_EXTERN PetscErrorCode SNESQNSetScaleType(SNES, SNESQNScaleType);
879: PETSC_EXTERN PetscErrorCode SNESQNSetRestartType(SNES, SNESQNRestartType);

881: PETSC_EXTERN PetscErrorCode SNESNASMGetType(SNES, PCASMType *);
882: PETSC_EXTERN PetscErrorCode SNESNASMSetType(SNES, PCASMType);
883: PETSC_EXTERN PetscErrorCode SNESNASMGetSubdomains(SNES, PetscInt *, SNES **, VecScatter **, VecScatter **, VecScatter **);
884: PETSC_EXTERN PetscErrorCode SNESNASMSetSubdomains(SNES, PetscInt, SNES *, VecScatter *, VecScatter *, VecScatter *);
885: PETSC_EXTERN PetscErrorCode SNESNASMSetDamping(SNES, PetscReal);
886: PETSC_EXTERN PetscErrorCode SNESNASMGetDamping(SNES, PetscReal *);
887: PETSC_EXTERN PetscErrorCode SNESNASMGetSubdomainVecs(SNES, PetscInt *, Vec **, Vec **, Vec **, Vec **);
888: PETSC_EXTERN PetscErrorCode SNESNASMSetComputeFinalJacobian(SNES, PetscBool);
889: PETSC_EXTERN PetscErrorCode SNESNASMGetSNES(SNES, PetscInt, SNES *);
890: PETSC_EXTERN PetscErrorCode SNESNASMGetNumber(SNES, PetscInt *);
891: PETSC_EXTERN PetscErrorCode SNESNASMSetWeight(SNES, Vec);

893: typedef enum {
894:   SNES_COMPOSITE_ADDITIVE,
895:   SNES_COMPOSITE_MULTIPLICATIVE,
896:   SNES_COMPOSITE_ADDITIVEOPTIMAL
897: } SNESCompositeType;
898: PETSC_EXTERN const char *const SNESCompositeTypes[];

900: PETSC_EXTERN PetscErrorCode SNESCompositeSetType(SNES, SNESCompositeType);
901: PETSC_EXTERN PetscErrorCode SNESCompositeAddSNES(SNES, SNESType);
902: PETSC_EXTERN PetscErrorCode SNESCompositeGetSNES(SNES, PetscInt, SNES *);
903: PETSC_EXTERN PetscErrorCode SNESCompositeGetNumber(SNES, PetscInt *);
904: PETSC_EXTERN PetscErrorCode SNESCompositeSetDamping(SNES, PetscInt, PetscReal);

906: PETSC_EXTERN PetscErrorCode SNESPatchSetDiscretisationInfo(SNES, PetscInt, DM *, PetscInt *, PetscInt *, const PetscInt **, const PetscInt *, PetscInt, const PetscInt *, PetscInt, const PetscInt *);
907: PETSC_EXTERN PetscErrorCode SNESPatchSetComputeOperator(SNES, PetscErrorCode (*func)(PC, PetscInt, Vec, Mat, IS, PetscInt, const PetscInt *, const PetscInt *, void *), void *);
908: PETSC_EXTERN PetscErrorCode SNESPatchSetComputeFunction(SNES, PetscErrorCode (*func)(PC, PetscInt, Vec, Vec, IS, PetscInt, const PetscInt *, const PetscInt *, void *), void *);
909: PETSC_EXTERN PetscErrorCode SNESPatchSetConstructType(SNES, PCPatchConstructType, PetscErrorCode (*func)(PC, PetscInt *, IS **, IS *, void *), void *);
910: PETSC_EXTERN PetscErrorCode SNESPatchSetCellNumbering(SNES, PetscSection);

912: /*E
913:     SNESFASType - Determines the type of nonlinear multigrid method that is run.

915:    Level: beginner

917:    Values:
918: +  `SNES_FAS_MULTIPLICATIVE` (default) - traditional V or W cycle as determined by `SNESFASSetCycles()`
919: .  `SNES_FAS_ADDITIVE`                 - additive FAS cycle
920: .  `SNES_FAS_FULL`                     - full FAS cycle
921: -  `SNES_FAS_KASKADE`                  - Kaskade FAS cycle

923: .seealso: [](chapter_snes), `SNESFAS`, `PCMGSetType()`, `PCMGType`
924: E*/
925: typedef enum {
926:   SNES_FAS_MULTIPLICATIVE,
927:   SNES_FAS_ADDITIVE,
928:   SNES_FAS_FULL,
929:   SNES_FAS_KASKADE
930: } SNESFASType;
931: PETSC_EXTERN const char *const SNESFASTypes[];

933: /* called on the finest level FAS instance*/
934: PETSC_EXTERN PetscErrorCode SNESFASSetType(SNES, SNESFASType);
935: PETSC_EXTERN PetscErrorCode SNESFASGetType(SNES, SNESFASType *);
936: PETSC_EXTERN PetscErrorCode SNESFASSetLevels(SNES, PetscInt, MPI_Comm *);
937: PETSC_EXTERN PetscErrorCode SNESFASGetLevels(SNES, PetscInt *);
938: PETSC_EXTERN PetscErrorCode SNESFASGetCycleSNES(SNES, PetscInt, SNES *);
939: PETSC_EXTERN PetscErrorCode SNESFASSetNumberSmoothUp(SNES, PetscInt);
940: PETSC_EXTERN PetscErrorCode SNESFASSetNumberSmoothDown(SNES, PetscInt);
941: PETSC_EXTERN PetscErrorCode SNESFASSetCycles(SNES, PetscInt);
942: PETSC_EXTERN PetscErrorCode SNESFASSetMonitor(SNES, PetscViewerAndFormat *, PetscBool);
943: PETSC_EXTERN PetscErrorCode SNESFASSetLog(SNES, PetscBool);

945: PETSC_EXTERN PetscErrorCode SNESFASSetGalerkin(SNES, PetscBool);
946: PETSC_EXTERN PetscErrorCode SNESFASGetGalerkin(SNES, PetscBool *);
947: PETSC_EXTERN PetscErrorCode SNESFASGalerkinFunctionDefault(SNES, Vec, Vec, void *);

949: /* called on any level -- "Cycle" FAS instance */
950: PETSC_EXTERN PetscErrorCode SNESFASCycleGetSmoother(SNES, SNES *);
951: PETSC_EXTERN PetscErrorCode SNESFASCycleGetSmootherUp(SNES, SNES *);
952: PETSC_EXTERN PetscErrorCode SNESFASCycleGetSmootherDown(SNES, SNES *);
953: PETSC_EXTERN PetscErrorCode SNESFASCycleGetCorrection(SNES, SNES *);
954: PETSC_EXTERN PetscErrorCode SNESFASCycleGetInterpolation(SNES, Mat *);
955: PETSC_EXTERN PetscErrorCode SNESFASCycleGetRestriction(SNES, Mat *);
956: PETSC_EXTERN PetscErrorCode SNESFASCycleGetInjection(SNES, Mat *);
957: PETSC_EXTERN PetscErrorCode SNESFASCycleGetRScale(SNES, Vec *);
958: PETSC_EXTERN PetscErrorCode SNESFASCycleSetCycles(SNES, PetscInt);
959: PETSC_EXTERN PetscErrorCode SNESFASCycleIsFine(SNES, PetscBool *);

961: /* called on the (outer) finest level FAS to set/get parameters on any level instance */
962: PETSC_EXTERN PetscErrorCode SNESFASSetInterpolation(SNES, PetscInt, Mat);
963: PETSC_EXTERN PetscErrorCode SNESFASGetInterpolation(SNES, PetscInt, Mat *);
964: PETSC_EXTERN PetscErrorCode SNESFASSetRestriction(SNES, PetscInt, Mat);
965: PETSC_EXTERN PetscErrorCode SNESFASGetRestriction(SNES, PetscInt, Mat *);
966: PETSC_EXTERN PetscErrorCode SNESFASSetInjection(SNES, PetscInt, Mat);
967: PETSC_EXTERN PetscErrorCode SNESFASGetInjection(SNES, PetscInt, Mat *);
968: PETSC_EXTERN PetscErrorCode SNESFASSetRScale(SNES, PetscInt, Vec);
969: PETSC_EXTERN PetscErrorCode SNESFASGetRScale(SNES, PetscInt, Vec *);
970: PETSC_EXTERN PetscErrorCode SNESFASSetContinuation(SNES, PetscBool);

972: PETSC_EXTERN PetscErrorCode SNESFASGetSmoother(SNES, PetscInt, SNES *);
973: PETSC_EXTERN PetscErrorCode SNESFASGetSmootherUp(SNES, PetscInt, SNES *);
974: PETSC_EXTERN PetscErrorCode SNESFASGetSmootherDown(SNES, PetscInt, SNES *);
975: PETSC_EXTERN PetscErrorCode SNESFASGetCoarseSolve(SNES, SNES *);

977: /* parameters for full FAS */
978: PETSC_EXTERN PetscErrorCode SNESFASFullSetDownSweep(SNES, PetscBool);
979: PETSC_EXTERN PetscErrorCode SNESFASCreateCoarseVec(SNES, Vec *);
980: PETSC_EXTERN PetscErrorCode SNESFASRestrict(SNES, Vec, Vec);
981: PETSC_EXTERN PetscErrorCode SNESFASFullSetTotal(SNES, PetscBool);
982: PETSC_EXTERN PetscErrorCode SNESFASFullGetTotal(SNES, PetscBool *);

984: PETSC_EXTERN PetscErrorCode DMSNESCheckDiscretization(SNES, DM, PetscReal, Vec, PetscReal, PetscReal[]);
985: PETSC_EXTERN PetscErrorCode DMSNESCheckResidual(SNES, DM, Vec, PetscReal, PetscReal *);
986: PETSC_EXTERN PetscErrorCode DMSNESCheckJacobian(SNES, DM, Vec, PetscReal, PetscBool *, PetscReal *);
987: PETSC_EXTERN PetscErrorCode DMSNESCheckFromOptions(SNES, Vec);
988: PETSC_EXTERN PetscErrorCode DMSNESComputeJacobianAction(DM, Vec, Vec, Vec, void *);
989: PETSC_EXTERN PetscErrorCode DMSNESCreateJacobianMF(DM, Vec, void *, Mat *);

991: #endif