DMFieldEvaluate#

Evaluate the field and its derivatives on a set of points

Synopsis#

#include "petscdmfield.h" 
#include "petscdmfield.h" 
PetscErrorCode DMFieldEvaluate(DMField field, Vec points, PetscDataType datatype, void *B, void *D, void *H)

Collective

Input Parameters#

field - The DMField object
points - The points at which to evaluate the field. Should have size d x n, where d is the coordinate dimension of the manifold and n is the number of points
datatype - The PetscDataType of the output arrays: either PETSC_REAL or PETSC_SCALAR. If the field is complex and datatype is PETSC_REAL, the real part of the field is returned.

Output Parameters#

B - pointer to data of size c * n * sizeof(datatype), where c is the number of components in the field. If B is not NULL, the values of the field are written in this array, varying first by component, then by point.
D - pointer to data of size d * c * n * sizeof(datatype). If D is not NULL, the values of the field’s spatial derivatives are written in this array, varying first by the partial derivative component, then by field component, then by point.
H - pointer to data of size d * d * c * n * sizeof(datatype). If H is not NULL, the values of the field’s second spatial derivatives are written in this array, varying first by the second partial derivative component, then by field component, then by point.