retrieves the global indices of the graph's vertices of nonzero indegree on this processor (i.e., the global indices of this processor's nonzero columns). If the graph is regarded as a multivalued map on integers, this is the image of the map (the union of the images of this processor's support indices).
Synopsis
#undef __FUNCT__
#define __FUNCT__ "MatIJGetImageIS"
PetscErrorCode MatIJGetImageIS(Mat A, IS *image)