PETSc version 3.17.0
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# PetscDTAltVPullbackMatrix

Compute the pullback matrix for k-forms under a linear transformation

### Synopsis

    #include "petscdt.h"
    PetscErrorCode PetscDTAltVPullbackMatrix(PetscInt N, PetscInt M, const PetscReal *L, PetscInt k, PetscReal *Lstar)

### Input Parameters

| N | - the dimension of the origin vector space of the linear transformation, N >= 0
| M | - the dimension of the image vector space of the linear transformation, M >= 0
| L | - a linear transformation, an [M x N] matrix in row-major format
| k | - the *signed* degree k of the |k|-forms on which Lstar acts, -(min(M,N)) <= k <= min(M,N). A negative form degree indicates that the pullback should be conjugated by the Hodge star operator (see note in PetscDTAltvPullback())

### Output Parameter

| Lstar | - the pullback matrix, an [(N choose |k|) x (M choose |k|)] matrix in row-major format such that Lstar * w = L^* w

### See Also

PetscDTAltV, PetscDTAltVPullback(), PetscDTAltVStar()

### Level

intermediate

### Location

src/dm/dt/interface/dtaltv.c
Index of all DT routines
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Index of all manual pages