PETSc version 3.17.0
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# DMMoabPToRMapping

Compute the mapping from the physical coordinate system for a given element to the canonical reference element. In addition to finding the inverse mapping evaluation through Newton iteration, the basis function at the parametric point is also evaluated optionally.

### Synopsis

    #include "petscdt.h"
    #include "petscdmmoab.h"
    PetscErrorCode DMMoabPToRMapping(const PetscInt dim, const PetscInt nverts, const PetscReal *coordinates, const PetscReal* xphy, PetscReal* natparam, PetscReal* phi)

### Input Parameters

| PetscInt dim | - the element dimension (1=EDGE, 2=QUAD/TRI, 3=HEX/TET)
| PetscInt nverts | - the number of vertices in the physical element
| PetscReal coordinates | - the coordinates of vertices in the physical element
| PetscReal[3] xphy | - the coordinates of physical point for which natural coordinates (in reference frame) are sought

### Output Parameters

| PetscReal[3] natparam | - the natural coordinates (in reference frame) corresponding to xphy
| PetscReal[nverts] phi | - the basis functions evaluated at the natural coordinates (natparam)

### Level

advanced

### Location

src/dm/impls/moab/dmmbfem.cxx
Index of all DMMOAB routines
Table of Contents for all manual pages
Index of all manual pages