petsc-3.8.3 2017-12-09
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Evaluate bases and derivatives at quadrature points for a EDGE2 or EDGE3 element.


#include "petscdt.h" 
#include "petscdmmoab.h"   
PetscErrorCode Compute_Lagrange_Basis_1D_Internal ( const PetscInt nverts, const PetscReal *coords, const PetscInt npts, const PetscReal *quad, PetscReal *phypts,
    PetscReal *jxw, PetscReal *phi, PetscReal *dphidx,
    PetscReal *jacobian, PetscReal *ijacobian, PetscReal *volume)
The routine is given the coordinates of the vertices of a linear or quadratic edge element.

The routine evaluates the basis functions associated with each quadrature point provided, and their derivatives with respect to X.


Example Physical Element

1-------2 1----3----2 EDGE2 EDGE3

Input Parameter

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 Parameter

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 phi[npts], the bases evaluated at the specified quadrature points -. PetscReal dphidx[npts], the derivative of the bases wrt X-direction evaluated at the specified quadrature points


DMMoab, FEM, 1-D

Index of all DM routines
Table of Contents for all manual pages
Index of all manual pages