func make_matrix(x, y) {
    y.of { x.of(0) };
}

var y = Sys.scanln("rows: ").to_i;
var x = Sys.scanln("cols: ").to_i;

var matrix = make_matrix(x, y);   # create the matrix
matrix[y/2][x/2] = 1;             # write something inside it
say matrix;                       # display the matrix