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

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