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5.1.101 ncols

Syntax:
ncols ( matrix_expression )
ncols ( smatrix_expression )
ncols ( intmat_expression )
ncols ( ideal_expression )
Type:
int
Purpose:
returns the number of columns of a matrix, an intmat, or the number of given generators of the ideal, including zeros.
Note:
size(ideal) counts the number of generators which are different from zero. (Use nrows to get the number of rows of a given matrix or intmat.)
Example:
 
  ring r;
  matrix m[5][6];
  ncols(m);
==> 6
  ideal i=x,0,y;
  ncols(i);
==> 3
  size(i);
==> 2
See matrix; nrows; size; smatrix.