petsc-3.14.0 2020-09-29
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convert a barycentric coordinate to an index


#include "petscdt.h" 
PetscErrorCode PetscDTBaryToIndex(PetscInt len, PetscInt sum, const PetscInt coord[], PetscInt *index)

Input Parameters

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
coord - a barycentric coordinate with the given length and sum

Output Parameter

index - the unique index for the coordinate, >= 0 and < Binomial(len - 1 + sum, sum)

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.

See Also





Index of all DT routines
Table of Contents for all manual pages
Index of all manual pages