Returns the number of elements in a block.


#include "petscis.h" 
PetscErrorCode  ISGetBlockSize(IS is,PetscInt *size)
Not Collective

Input Parameter

is - the index set

Output Parameter

size - the number of elements in a block

Level: intermediate


This is much like the block size for Vecs. It indicates that one can think of the indices as being in a collection of equal size blocks. For ISBlock() these collections of blocks are all contiquous within a block but this is not the case for other IS. ISBlockGetIndices() only works for ISBlock IS, not others.

See Also

ISBlockGetSize(), ISGetSize(), ISCreateBlock(), ISSetBlockSize()