petsc-3.13.6 2020-09-29

PetscDTAltVInteriorPattern

compute the sparsity and sign pattern of the interior product matrix computed in PetscDTAltVInteriorMatrix()

Synopsis

#include "petscdt.h" 
PetscErrorCode PetscDTAltVInteriorPattern(PetscInt N, PetscInt k, PetscInt (*indices)[3])

Input Arguments

	N	- the dimension of the vector space, N >= 0
	k	- the degree of the k-forms on which intvMat from PetscDTAltVInteriorMatrix() acts, 0 <= k <= N.

Output Arguments

indices -The interior product matrix intvMat has size [(N choose (k-1)) x (N choose k)] and has (N choose k) * k non-zeros. indices[i][0] and indices[i][1] are the row and column of a non-zero, and its value is equal to the vector coordinate v[j] if indices[i][2] = j, or -v[j] if indices[i][2] = -(j+1)

Note: this function is useful when the interior product needs to be computed at multiple locations, as when computing the Koszul differential

Level

intermediate

Location