random matrix with a given number of specified elements

Hello,

How can we generate a matrix n x n Whose elements can be only two values AND where number of one of those two elements is given?

For instance, in the 3 x 3 matrix elements can be only 0 et 1, But I want exactly 4 elements to be zeros (and therefore 5 elements to be ones)

Thank you

[madhan ravi]

Did you try something for your homework ?

[sko]

I only did research on random numbers generation but I didn’t find the answer on the second part of my needs i.e. specifying the number (amount) of a given element (number).

Answer 1

[madhan ravi]

 v = [repelem(1, 5), repelem(0, 4)];
 Wanted = v(reshape(randperm(numel(v)), 3, []))

[sko]

Thank you very much.

This is what I need!

Best wishes

Answer 2

[Bruno Luong]

User inputs

matsz = [3,3];
n1 = 4; % number of desired 1s, no need to specify for 0s

Generate

B = zeros(matsz); % + 0; 
B(randperm(numel(B),n1)) = 1;

Quick check

B

[sko]

This works too!

Thank you very much.