MatGetColumnNorms
Gets the norms of each column of a sparse or dense matrix.
Synopsis
#include "petscmat.h"
PetscErrorCode MatGetColumnNorms(Mat A,NormType type,PetscReal norms[])
Input Parameter
 A   the matrix

 type   NORM_2, NORM_1 or NORM_INFINITY

Output Parameter
 norms   an array as large as the TOTAL number of columns in the matrix

Level: intermediate
Notes
Each process has ALL the column norms after the call. Because of the way this is computed each process gets all the values,
if each process wants only some of the values it should extract the ones it wants from the array.
See Also
NormType, MatNorm()
Location:getcolv.c