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# PetscDualSpaceApplyDefault

Apply a functional from the dual space basis to an input function by assuming a point evaluation functional.

## Synopsis

    #include "petscfe.h"
    PetscErrorCode PetscDualSpaceApplyDefault(PetscDualSpace sp, PetscInt f, PetscReal time, PetscFEGeom *cgeom, PetscInt Nc, PetscErrorCode (*func)(PetscInt, PetscReal, const PetscReal[], PetscInt, PetscScalar *, void *), void *ctx, PetscScalar *value)

## Input Parameters

- sp - The `PetscDualSpace` object

- f - The basis functional index

- time - The time

- cgeom - A context with geometric information for this cell, we use v0 (the initial vertex) and J (the Jacobian)

- Nc - The number of components for the function

- func - The input function

- ctx - A context for the function

## Output Parameter

- value - The output value

## Calling sequence

       PetscErrorCode func(PetscInt dim, PetscReal time, const PetscReal x[],PetscInt numComponents, PetscScalar values[], void *ctx)

## Note

The idea is to evaluate the functional as an integral \( n(f) = \int dx n(x) . f(x) \) where both n and f have Nc components.

## See Also

`PetscDualSpace`, `PetscDualSpaceCreate()`

## Level

advanced

## Location

src/dm/dt/dualspace/interface/dualspace.c

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