DMSNESGetJacobian#

get SNES Jacobian evaluation function

Synopsis#

#include "petscsnes.h" 
#include "petscdm.h" 
PetscErrorCode DMSNESGetJacobian(DM dm, PetscErrorCode (**J)(SNES, Vec, Mat, Mat, void *), void **ctx)

Not Collective

Input Parameter#

  • dm - DM to be used with SNES

Output Parameters#

  • J - Jacobian evaluation function; for all calling sequence see SNESJacobianFunction

  • ctx - context for residual evaluation

Note#

SNESGetJacobian() is normally used, but it calls this function internally because the user context is actually associated with the DM. This makes the interface consistent regardless of whether the user interacts with a DM or not.

Developer Note#

If DM took a more central role at some later date, this could become the primary method of setting the Jacobian.

See Also#

DMSNESSetContext(), SNESSetFunction(), DMSNESSetJacobian(), SNESJacobianFunction

Level#

advanced

Location#

src/snes/utils/dmsnes.c

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Index of all SNES routines
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Index of all manual pages