DMFieldEvaluateFE#
Evaluate the field and its derivatives on a set of points mapped from quadrature points on a reference point. The derivatives are taken with respect to the reference coordinates.
Synopsis#
#include "petscdmfield.h" 
#include "petscdmfield.h" 
PetscErrorCode DMFieldEvaluateFE(DMField field, IS cellIS, PetscQuadrature points, PetscDataType datatype, void *B, void *D, void *H)
Not Collective
Input Parameters#
- field - The - DMFieldobject
- cellIS - Index set for cells on which to evaluate the field 
- points - The quadature containing the points in the reference cell at which to evaluate the field. 
- 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, DM, DMFieldGetNumComponents(), DMFieldEvaluate(), DMFieldEvaluateFV()
Level#
intermediate
Location#
Examples#
Implementations#
DMFieldEvaluateFE_DA() in src/dm/field/impls/da/dmfieldda.c
DMFieldEvaluateFE_DS() in src/dm/field/impls/ds/dmfieldds.c
Index of all DM routines
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Index of all manual pages