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 - DMFieldobject
- 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_REALor- 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. 
See Also#
DMField, DMFieldGetDM(), DMFieldGetNumComponents(), DMFieldEvaluateFE(), DMFieldEvaluateFV(), PetscDataType
Level#
intermediate
Location#
Examples#
Implementations#
DMFieldEvaluate_DA() in src/dm/field/impls/da/dmfieldda.c
DMFieldEvaluate_DS() in src/dm/field/impls/ds/dmfieldds.c
Index of all DM routines
Table of Contents for all manual pages
Index of all manual pages