#include "petscdt.h" PetscErrorCode PetscDTGradedOrderToIndex(PetscInt len, const PetscInt degtup, PetscInt *index)
|len||- the length of the degree tuple|
|degtup||- tuple with this length|
|index||- index in graded order: >= 0|
Note: for two tuples x and y with the same degree sum, partial degree sums over the final elements of the tuples acts as a tiebreaker. For example, (2, 1, 1) and (1, 2, 1) have the same degree sum, but the degree sum over the last two elements is smaller for the former, so (2, 1, 1) < (1, 2, 1).