petsc-3.7.7 2017-09-25
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This function computes the L_2 difference between the gradient of a function u and an FEM interpolant solution grad u_h.


#include "petscdm.h"          
#include "petscdmlabel.h"     
PetscErrorCode DMComputeL2GradientDiff(DM dm, PetscReal time, PetscErrorCode (**funcs)(PetscInt, PetscReal, const PetscReal [], const PetscReal[], PetscInt, PetscScalar *, void *), void **ctxs, Vec X, const PetscReal n[], PetscReal *diff)

Input Parameters

dm - The DM , time - The time
funcs - The gradient 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
n - The vector to project along

Output Parameter

diff -The diff ||(grad u - grad u_h) . n||_2

See Also

DMProjectFunction(), DMComputeL2Diff()

Index of all DM routines
Table of Contents for all manual pages
Index of all manual pages