Symmetric binary matrix with diagonal 0 values

I want to create a symmetric (10x10) binary matrix with n number of ones and the diagonal values ​​have to be 0s. Can anyone help me?

[James Tursa]

1's can be located anywhere, just not on the diagonal? Random locations? I am assuming n must be even?

Answer 1

[Guillaume]

Guaranteed to work on the first try:

Msize = 10;  %size of square matrix
N = 20; %number of ones on each side of the diagonale

M = zeros(Msize);
indices = nonzeros(tril(reshape(1:Msize^2, Msize, Msize), -1));  %get indices BELOW diagonale
M(indices(randperm(numel(indices), N))) = 1;  %pick N indices and fill with 1
M = M | M.'   %do the symmetry

[Dina Tarek]

Thanks it worked, I almost lost hope to make it

[Dina Tarek]

Error using randperm

Inputs must be nonnegative scalar integers.

The above message appeared when I tried diffrent Msize

for example Msize = 12 or 13 or 9 ;

do you know how to solve this error

[Guillaume]

Your N is either non-integer, non-positive, or non-scalar.

Answer 2

[KALYAN ACHARJYA]

Beware: Before Try (I posted it as answer, so that you may get some idea)

n=input('Eneter the value of n: ')
result=zeros(10,10);
while sum(result)~=n
result=ones(10,10)-diag(diag(ones(10,10))) & randi([0 1],[10 10]);
end
result

When it will works, depending on luck, as I have no idea how to control number on 1 generation in random matrics, but I have forced all diagonal elements to zeros.

During running the Matlab (Execution), you can stop it by pression Ctrl+S

[Dina Tarek]

Thanks for your help