petsc-3.11.3 2019-06-26
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# PetscFEGetTabulation

Tabulates the basis functions, and perhaps derivatives, at the points provided.

### Synopsis

```#include "petscfe.h"
PetscErrorCode PetscFEGetTabulation(PetscFE fem, PetscInt npoints, const PetscReal points[], PetscReal **B, PetscReal **D, PetscReal **H)
```
Not collective

### Input Parameters

 fem - The PetscFE object npoints - The number of tabulation points points - The tabulation point coordinates

### Output Parameters

 B - The basis function values at tabulation points D - The basis function derivatives at tabulation points H - The basis function second derivatives at tabulation points

### Note

```B[(p*pdim + i)*Nc + c] is the value at point p for basis function i and component c
```
```D[((p*pdim + i)*Nc + c)*dim + d] is the derivative value at point p for basis function i, component c, in direction d
```
```H[(((p*pdim + i)*Nc + c)*dim + d)*dim + e] is the value at point p for basis function i, component c, in directions d and e
```

PetscFERestoreTabulation(), PetscFEGetDefaultTabulation()

intermediate

### Location

src/dm/dt/fe/interface/fe.c

### Implementations

PetscFEGetTabulation_Basic in src/dm/dt/fe/impls/basic/febasic.c
PetscFEGetTabulation_Composite in src/dm/dt/fe/impls/composite/fecomposite.c
src/dm/dt/fe/impls/opencl/feopencl.c:772:PETSC_EXTERN PetscErrorCode PetscFEGetTabulation_Basic(PetscFE, PetscInt, const PetscReal [],
Index of all DM routines