Generating a random symmetric matrix

I am trying to generate a random symmetric matrix consisting of 1s and 0s (adjacency matrix)

I have the following;

A = randi(2,N,N) - 1 % Generates a random nxn matrix with values 0 or 1 (Adjacency Matrix)

However this produces a random adjacency matrix which is not symmetric.

How can I change this code to make the matrix symmetric?

Answer 1

[Alexandra Harkai]

A = randi(2,N,N) - 1;
A = A - tril(A,-1) + triu(A,1)';

This will copy the upper triangle to the lower triangle.