petsc-3.7.7 2017-09-25
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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"     
PetscErrorCode DMComputeL2Diff(DM dm, PetscReal time, PetscErrorCode (**funcs)(PetscInt, PetscReal, const PetscReal [], PetscInt, PetscScalar *, void *), void **ctxs, Vec X, PetscReal *diff)

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

Output Parameter

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

See Also

DMProjectFunction(), DMComputeL2FieldDiff(), DMComputeL2GradientDiff()

Level:developer
Location:src/dm/interface/dm.c
Index of all DM routines
Table of Contents for all manual pages
Index of all manual pages

Examples

src/snes/examples/tutorials/ex12.c.html
src/snes/examples/tutorials/ex62.c.html