MatSNESMFSetType

Sets the method that is used to compute the differencing parameter for finite difference matrix-free formulations.

Synopsis

int MatSNESMFSetType(Mat mat,char *ftype)

Input Parameters

mat - the "matrix-free" matrix created via MatCreateSNESMF()
ftype - the type requested

Notes

For example, such routines can compute h for use in Jacobian-vector products of the form

F(x+ha) - F(x) F'(u)a ~= ---------------- h

See Also

MatCreateSNESMF(), MatSNESMFRegister()

Level:advanced
Location:src/snes/mf/snesmfj.c
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