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# DMMoabFEMComputeBasis
Evaluate bases and derivatives at quadrature points for a linear EDGE/QUAD/TRI/HEX/TET element. 
## Synopsis
```
#include "petscdt.h" 
#include "petscdmmoab.h"   
PetscErrorCode DMMoabFEMComputeBasis(const PetscInt dim, const PetscInt nverts, const PetscReal *coordinates, const PetscQuadrature quadrature, PetscReal *phypts, PetscReal *jacobian_quadrature_weight_product, PetscReal *fe_basis, PetscReal **fe_basis_derivatives)
```
The routine takes the coordinates of the vertices of an element and computes basis functions associated with
each quadrature point provided, and their derivatives with respect to X, Y and Z as appropriate.


## Input Parameters

- ***PetscInt  nverts -*** the number of element vertices
- ***PetscReal coords[3*nverts] -*** the physical coordinates of the vertices (in canonical numbering)
- ***PetscInt  npts -*** the number of evaluation points (quadrature points)
- ***PetscReal quad[3*npts] -*** the evaluation points (quadrature points) in the reference space



## Output Parameters

- ***PetscReal phypts[3*npts] -*** the evaluation points (quadrature points) transformed to the physical space
- ***PetscReal jxw[npts] -*** the jacobian determinant * quadrature weight necessary for assembling discrete contributions
- ***PetscReal fe_basis[npts] -*** the bases values evaluated at the specified quadrature points
- ***PetscReal fe_basis_derivatives[dim][npts] -*** the derivative of the bases wrt (X,Y,Z)-directions (depending on the dimension) evaluated at the specified quadrature points





## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/impls/moab/dmmbfem.cxx.html#DMMoabFEMComputeBasis">src/dm/impls/moab/dmmbfem.cxx</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex35.cxx.html">src/ksp/ksp/tutorials/ex35.cxx</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex36.cxx.html">src/ksp/ksp/tutorials/ex36.cxx</A><BR>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/dm/impls/moab/dmmbfem.cxx)


[Index of all DMMOAB routines](index.md)  
[Table of Contents for all manual pages](/manualpages/index.md)  
[Index of all manual pages](/manualpages/singleindex.md)