PETSc version 3.17.0
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# PetscDSSetExactSolution

Set the pointwise exact solution function for a given test field

### Synopsis

    #include "petscds.h"
    PetscErrorCode PetscDSSetExactSolution(PetscDS prob, PetscInt f, PetscErrorCode (*sol)(PetscInt dim, PetscReal t, const PetscReal x[], PetscInt Nc, PetscScalar u[], void *ctx), void *ctx)

Not collective

### Input Parameters

| prob | - The PetscDS
| f | - The test field number
| sol | - solution function for the test fields
| ctx | - solution context or NULL

### Note: The calling sequence for solution functions is given by

    sol(PetscInt dim, PetscReal t, const PetscReal x[], PetscInt Nc, PetscScalar u[], void *ctx)

| dim | - the spatial dimension
| t | - current time
| x | - coordinates of the current point
| Nc | - the number of field components
| u | - the solution field evaluated at the current point
| ctx | - a user context

### See Also

PetscDSGetExactSolution()

### Level

intermediate

### Location

src/dm/dt/interface/dtds.c

### Examples

src/snes/tutorials/ex12.c.html
src/snes/tutorials/ex17.c.html
src/snes/tutorials/ex62.c.html
src/snes/tutorials/ex69.c.html
src/ts/tutorials/ex45.c.html
src/ts/tutorials/ex46.c.html
src/tao/tutorials/ex1.c.html
src/tao/tutorials/ex2.c.html
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