DMProjectFunctionLocal — PETSc 3.25.4 documentation

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# DMProjectFunctionLocal

This projects the given function into the function space provided by a `DM`, putting the coefficients in a local vector.

## Synopsis

    #include "petscdm.h"
    #include "petscdmlabel.h"
    #include "petscds.h"
    PetscErrorCode DMProjectFunctionLocal(DM dm, PetscReal time, PetscErrorCode (**funcs)(PetscInt dim, PetscReal time, const PetscReal x[], PetscInt Nc, PetscScalar *u, PetscCtx ctx), void **ctxs, InsertMode mode, Vec localX)

Not Collective

## Input Parameters

- dm - The `DM`

- time - The time

- funcs - The coordinate functions to evaluate, one per field

- ctxs - Optional array of contexts to pass to each coordinate function. ctxs itself may be null.

- mode - The insertion mode for values

## Output Parameter

- localX - vector

## Calling sequence of `funcs`

- dim - The spatial dimension

- time - The current timestep

- x - The coordinates

- Nc - The number of components

- u - The output field values

- ctx - optional function context

## Developer Notes

This API is specific to only particular usage of `DM`

The notes need to provide some information about what has to be provided to the `DM` to be able to perform the computation.

## See Also

DM Basics, `DM`, `DMProjectFunction()`, `DMProjectFunctionLabel()`, `DMComputeL2Diff()`

## Level

developer

## Location

src/dm/interface/dm.c

## Examples

src/snes/tutorials/ex12.c
src/dm/field/tutorials/ex1.c
src/snes/tutorials/ex77.c
src/ts/tutorials/ex47.c

## Implementations

DMProjectFunctionLocal_pforest(DM dm, PetscReal time, PetscErrorCode (**funcs)() in src/dm/impls/forest/p4est/pforest.h
DMProjectFunctionLocal_Plex(DM dm, PetscReal time, PetscErrorCode (**funcs)() in src/dm/impls/plex/plexproject.c

Index of all DM routines
Table of Contents for all manual pages
Index of all manual pages