set rows and columns of matrices

SYNOPSIS

#include "matrix.h"
MAT   *set_col(MAT *A, int k, VEC *out)
MAT   *set_row(MAT *A, int k, VEC *out)

#include "zmatrix.h"
ZMAT  *zset_col(ZMAT *A, int k, ZVEC *out)
ZMAT  *zset_row(ZMAT *A, int k, ZVEC *out)

DESCRIPTION

The routines set_col() and zset_col() above sets the value of the $k$th column of A to be the values of out. The A matrix so modified is returned. The routine set_row() above sets the value of the $k$th row of A to be the values of out. The A matrix so modified is returned. If out is NULL, then an E_NULL error is raised. If k is negative or greater than or equal to the number of columns or rows respectively, an E_BOUNDS error is raised. As the MAT and ZMAT data structures are row-oriented data structures, the set_row() routine is faster than the set_col() routine.

EXAMPLE

MAT   *A;
VEC   *tmp;
  ......
/* scale row 3 of A by 2.0 */
tmp = get_row(A,3,VNULL);
sv_mlt(2.0,tmp,tmp);
set_row(A,3,tmp);