Matrix with two diagonals

func dual_diagonal(n) {
    n.of {|k|
        var r = (k.of(0) + [1] + (n - k - 1).of(0))
        r ~Z| r.reverse
    }
}
 
dual_diagonal(5).each{.join(' ').say}; say ''
dual_diagonal(6).each{.join(' ').say}

Output:

1 0 0 0 1
0 1 0 1 0
0 0 1 0 0
0 1 0 1 0
1 0 0 0 1

1 0 0 0 0 1
0 1 0 0 1 0
0 0 1 1 0 0
0 0 1 1 0 0
0 1 0 0 1 0
1 0 0 0 0 1