PetscDTGradedOrderToIndex#

convert a tuple into an index in a graded order, the inverse of PetscDTIndexToGradedOrder().

Synopsis#

#include "petscdt.h" 
PetscErrorCode PetscDTGradedOrderToIndex(PetscInt len, const PetscInt degtup[], PetscInt *index)

Input Parameters#

len - the length of the degree tuple
degtup - tuple with this length

Output Parameter#

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).

Level#

Beginner

Location#

src/dm/dt/interface/dt.c

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