petsc-master 2019-09-20
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DMPlexComputeJacobianAction

Form the local portion of the Jacobian action Z = J(X) Y at the local solution X using pointwise functions specified by the user.

Synopsis

#include "petscdmplex.h" 
#include "petscsnes.h"   
PetscErrorCode DMPlexComputeJacobianAction(DM dm, IS cellIS, PetscReal t, PetscReal X_tShift, Vec X, Vec X_t, Vec Y, Vec Z, void *user)

Input Parameters

dm - The mesh
cellIS -
t - The time
X_tShift - The multiplier for the Jacobian with repsect to X_t
X - Local solution vector
X_t - Time-derivative of the local solution vector
Y - Local input vector
user - The user context

Output Parameter

Z -Local output vector

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

FormFunctionLocal()

Level

developer

Location

src/snes/utils/dmplexsnes.c
Index of all SNES routines
Table of Contents for all manual pages
Index of all manual pages