petsc-3.14.0 2020-09-29
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PetscDTIndexToBary

convert an index into a barycentric coordinate.

Synopsis

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

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
index - the index to convert: should be >= 0 and < Binomial(len - 1 + sum, sum)

Output Parameter

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.

See Also

PetscDTBaryToIndex()

Level

beginner

Location

src/dm/dt/interface/dt.c
Index of all DT routines
Table of Contents for all manual pages
Index of all manual pages