How to change block order between MatLab Sessions (Psychtoolbox)

I have a code which is meant to shuffle a block order in psychtool box, written:

s_block = Shuffle(obj.block);

for i = 1:length(s_block)
   

Which will change the order between runs if the code is run consecutive times. However, whenever I close the program and reopen it it, it goes back to the first run's order. I have tried randomsample(obj.block,n) where n can be any interger from 1 to 8 and it will still produce the same order, but if i go over 8 it will freeze (there are 8 blocks presented). The only code I've had even partial luck with is:

    s_block = randperm(obj.block)

Which generates a new order, but has the same issue (if i close the program and reopen it, it goes back to this new order)

I've also tried

    s_block = randperm(obj.block,n)

And it still goes back to this second order.

Any suggestions would be helpful on how I can resolve this. Thanks!

Answer 1

[Walter Roberson]

    rng('shuffle') seeds the random number generator based on the current
    time so that RAND, RANDI, and RANDN produce a different sequence of
    numbers after each time you call rng.