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
Input Parameters#
dm - The
DMtime - 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.
See Also#
DM Basics, DM, DMProjectFunction(), DMComputeL2FieldDiff(), DMComputeL2GradientDiff()
Level#
developer
Location#
Examples#
src/snes/tutorials/ex12.c
src/snes/tutorials/ex13.c
src/ts/tutorials/ex47.c
src/snes/tutorials/ex63.c
src/tao/tutorials/ex1.c
src/tao/tutorials/ex2.c
src/snes/tutorials/ex75.c
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
Index of all DM routines
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Index of all manual pages