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# PetscFECompositeGetMapping

Returns the mappings from the reference element to each subelement

## Synopsis

    #include "petscfe.h"
    #include "petscdt.h"
    PetscErrorCode PetscFECompositeGetMapping(PetscFE fem, PetscInt *numSubelements, const PetscReal *v0[], const PetscReal *jac[], const PetscReal *invjac[])

Not Collective

## Input Parameter

- fem - The `PetscFE` object

## Output Parameters

- numSubelements - The number of sub elements

- v0 - The affine transformation for each element, an array of length \(dim * Nc\). Pass `NULL` to ignore.

- jac - The Jacobian for each element, an array of length \(dim^2 * Nc\). Pass `NULL` to ignore.

- invjac - The inverse of the Jacobian, an array of length \(dim^2 * Nc\). Pass `NULL` to ignore.

## Note

Do not free the output arrays.

## See Also

`PetscFE`, `PetscFECreate()`

## Level

intermediate

## Location

src/dm/dt/fe/impls/composite/fecomposite.c

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