# how to generate symmetric matrix with zero-one elements, complexity index of this matrix (number of ones / (size )^2) = any number from zero to 1 and diagonal equal ones

10 views (last 30 days)
Hayam Wahdan on 21 Jan 2016
Commented: Star Strider on 23 Jan 2016
how to generate symmetric matrix with zero-one elements, complexity index of this matrix (number of ones / (size )^2) = any number from zero to 1 and diagonal equal ones???

#### 1 Comment

Star Strider on 23 Jan 2016
@Hayam — I thought you might be the only person who wanted the matrix, but it’s gotten several downloads in the 8 hours since I uploaded it!

Star Strider on 22 Jan 2016
I have no idea if anyone else will ever use it, but it was intriguing enough as a problem for me to make it reasonably robust and put it up on the File Exchange. I’ll take it down eventually if it doesn’t generate any other interest.

Triveni on 22 Jan 2016
Edited: Triveni on 22 Jan 2016
A = [1 2 3 4 5; 1 2 3 4 5; 1 2 3 4 5];
symmetry = [A, flip(A)];
if you need diagonal as ones use
B =diag(symmetry) ==ones;

#### 1 Comment

Hayam Wahdan on 22 Jan 2016
I need zero one matrix with number of ones = 0.7 ( any number from zero to one ) and oned in diagonal