DMComputeL2Diff#

This function computes the L_2 difference between a function u and an FEM interpolant solution u_h.

Synopsis#

#include "petscdm.h"          
#include "petscdmlabel.h"     
#include "petscds.h"     
PetscErrorCode DMComputeL2Diff(DM dm, PetscReal time, PetscErrorCode (**funcs)(PetscInt, PetscReal, const PetscReal[], PetscInt, PetscScalar *, void *), void **ctxs, Vec X, PetscReal *diff)

Collective on dm

Input Parameters#

dm - The DM
time - The time
funcs - The functions to evaluate for each field component
ctxs - Optional array of contexts to pass to each function, or NULL.
X - The coefficient vector u_h, a global vector

Output Parameter#

diff - The diff ||u - u_h||_2

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.

Level#

developer

Location#

src/dm/interface/dm.c

Examples#

src/snes/tutorials/ex12.c.html
src/snes/tutorials/ex13.c.html
src/snes/tutorials/ex63.c.html
src/snes/tutorials/ex75.c.html
src/ts/tutorials/ex47.c.html
src/ts/tutorials/ex48.c.html
src/tao/tutorials/ex1.c.html
src/tao/tutorials/ex2.c.html

Implementations#

DMComputeL2Diff_pforest(DM dm, PetscReal time, PetscErrorCode (**funcs) in src/dm/impls/forest/p4est/pforest.h
DMComputeL2Diff_Plex(DM dm, PetscReal time, PetscErrorCode (**funcs) in src/dm/impls/plex/plexfem.c

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