#include "petscdt.h" PetscErrorCode PetscDTIndexToBary(PetscInt len, PetscInt sum, PetscInt index, PetscInt coord)
|len||- the desired length of the barycentric tuple (usually 1 more than the dimension it represents, so a barycentric coordinate in a triangle has length 3)|
|sum||- the value that the sum of the barycentric coordinates (which will be non-negative integers) should sum to|
|index||- the index to convert: should be >= 0 and < Binomial(len - 1 + sum, sum)|
|coord||- will be filled with the barycentric coordinate|
Note: the indices map to barycentric coordinates in lexicographic order, where the first index is the least significant and the last index is the most significant.