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