text: define([], function () {
  
    function zeros(n, m) {
  
      if (m == null) {
        m = n;
      }
      var out = [];
      for (var i = 0; i < n; i++) {
        out.push([]);
        for (var j = 0; j < m; j++) {
          out[i][j] = 0;
        }
      }
      return out;
    }
  
    zeros.shortHelp = "Creates a matrix of all zeros.";
    zeros.help = "# zeros(n, m) \n \
  Creates a matrix of dimensions n x m of all zeros.  If only 'n' \
  is input, the output matrix is of dimensions n x n \n";
  
    return zeros;
  });