PETSc version 3.15.5
DMComputeL2FieldDiff
This function computes the L_2 difference between a function u and an FEM interpolant solution u_h, separated into field components. 
Synopsis
#include "petscdm.h"          
#include "petscdmlabel.h"     
#include "petscds.h"     
PetscErrorCode DMComputeL2FieldDiff(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 array of differences, ||u^f - u^f_h||_2 | 
See Also
 DMProjectFunction(), DMComputeL2FieldDiff(), DMComputeL2GradientDiff()
Level
developer
Location
src/dm/interface/dm.c
Examples
src/ts/tutorials/ex46.c.html
Implementations
DMComputeL2FieldDiff_pforest(DM dm, PetscReal time, PetscErrorCode (**funcs)  in src/dm/impls/forest/p4est/pforest.c
DMComputeL2FieldDiff_Plex(DM dm, PetscReal time, PetscErrorCode (**funcs) in src/dm/impls/plex/plexfem.c
Index of all DM routines
Table of Contents for all manual pages
Index of all manual pages