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matrix_is_lower_triangular

By Daniel · January 1, 2009

Returns whether some square matrix M is a lower triangular matrix. M should be a ds_grid filled with real entries.

/* matrix_is_lower_triangular(M, strict)
 *
 * Returns whether some square matrix M is a lower triangular matrix. M
 * should be a ds_grid filled with real entries.
 */

var xStart, i, j;

xStart = ds_grid_width(argument0) - 1;

for (i = 0; i < xStart + argument1; i += 1)
  for (j = 0; j <= i; j += 1)
    if (ds_grid_get(argument0, xStart - i + j, j) != 0)
      return false;

return true;

Categories: Mathematics

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