MATLAB: I want to create a nxn matrix with all 0s and n randomly placed 1s

Question

I want to create a nxn zero matrix with n randomly placed ones in the matrix

Example

1st try

1 0 0
0 1 0
0 0 1

2nd Try

0 0 1
0 1 1
0 0 0

Answer 1

n = whatever;
x = zeros(n);
x(randperm(n*n,n)) = 1;