:orphan:
# PetscDTAltVWedgeMatrix
Compute the matrix defined by the wedge product with a given j-form that maps k-forms to (j+k)-forms 
## Synopsis
```
#include "petscdt.h" 
PetscErrorCode PetscDTAltVWedgeMatrix(PetscInt N, PetscInt j, PetscInt k, const PetscReal *a, PetscReal *awedgeMat)
```

## Input Parameters

- ***N -*** the dimension of the vector space, N >= 0
- ***j -*** the degree j of the j-form a, 0 <= j <= N
- ***k -*** the degree k of the k-forms that (a wedge) will be applied to, 0 <= k <= N and 0 <= j+k <= N
- ***a -*** a j-form, size [N choose j]



## Output Parameter

- ***awedge -*** (a wedge), an [(N choose j+k) x (N choose k)] matrix in row-major order, such that (a wedge) * b = a wedge b





## See Also
 `PetscDTAltV`, `PetscDTAltVPullback()`, `PetscDTAltVPullbackMatrix()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/dt/interface/dtaltv.c.html#PetscDTAltVWedgeMatrix">src/dm/dt/interface/dtaltv.c</A>


---
[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/dm/dt/interface/dtaltv.c)


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