petsc-3.14.5 2021-03-03
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# DMComputeL2DiffLocal

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

### Synopsis

    #include "petscdmplex.h"
    PetscErrorCode DMPlexComputeL2DiffLocal(DM dm, PetscReal time, PetscErrorCode (**funcs)(PetscInt, PetscReal, const PetscReal [], PetscInt, PetscScalar *, void *), void **ctxs, Vec localX, 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.
| localX | - The coefficient vector u_h, a local vector

### Output Parameter

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

### See Also

DMProjectFunction(), DMComputeL2FieldDiff(), DMComputeL2GradientDiff()

### Level

developer

### Location

src/dm/impls/plex/plexfem.c
Index of all DMPLEX routines
Table of Contents for all manual pages
Index of all manual pages