Random number generation

[Alice12]

Thanks for your suggestion.

I obtain the matrix from another experiment and need to used it in yet another experiment. For each pair of experiment the matrix is unique.I have

to perform them several times. Your new suggestion is perfectly fine but I wiill have to do it again and again for each pair of experiment. In fact,

I have been doing this till now but it is time consuming.

I coded your first suggestion using a while loop but when used with the actual program (which is driving the experiment), it seems that the program sometimes overrides the "code".

Now I plan to do post processing of the matrix to implement what I have been doing till now ( your recent suggestion). Any idea how to do it ?

[RavensFan]

Post your code.  Everything you've said so far is called basic programming.  Having the computer do something over and over again.  You say it is time-consuming.  How much time does it take?

How does your program "override the code".

"Post processing the matrix, how do I do it?"  I have no idea.  You haven't given any details on what you are trying to do.