DMPlexSNESComputeJacobianFEM#

Form the local portion of the Jacobian matrix Jac at the local solution X using pointwise functions specified by the user.

Synopsis#

#include "petscdmplex.h" 
#include "petscsnes.h"   
PetscErrorCode DMPlexSNESComputeJacobianFEM(DM dm, Vec X, Mat Jac, Mat JacP, void *user)

Input Parameters#

  • dm - The DM

  • X - Local input vector

  • user - The user context

Output Parameters#

  • Jac - Jacobian matrix

  • JacP - approximate Jacobian from which the preconditioner will be built, often Jac

Note#

We form the residual one batch of elements at a time. This allows us to offload work onto an accelerator, like a GPU, or vectorize on a multicore machine.

See Also#

DMPLEX, Mat

Level#

developer

Location#

src/snes/utils/dmplexsnes.c

Examples#

src/tao/tutorials/ex3.c

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Index of all SNES routines
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Index of all manual pages