petsc-3.14.5 2021-03-03
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# DMSNESCheckJacobian

Check the Jacobian of the exact solution against the residual using the Taylor Test

### Synopsis

    #include "petscdmplex.h"
    #include "petscsnes.h"
    PetscErrorCode DMSNESCheckJacobian(SNES snes, DM dm, Vec u, PetscReal tol, PetscBool *isLinear, PetscReal *convRate)

### Input Parameters

| snes | - the SNES object
| dm | - the DM
| u | - a DM vector
| tol | - A tolerance for the check, or -1 to print the results instead

### Output Parameters

| isLinear | - Flag indicaing that the function looks linear, or NULL
| convRate | - The rate of convergence of the linear model, or NULL

### See Also

DNSNESCheckFromOptions(), DMSNESCheckDiscretization(), DMSNESCheckResidual()

### 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