Yes Rick you are right, I am using the iteration number to create some variables. I have attatched my program. Im thinking maybe its best if I rewrite my program and avoiding using the iteration numbers for creating variables. I tried changing the number of macro variables and macros as ballardw suggested. Also tried to increace symsize and worksize to 150.000 I think without success. In my program, the problem occurs when im increasing P (number of variables in the simulated data set) to 20, 50, 100. Then I am not allowed to to many replicates (R) at all. For P=20 I have managed to do 500 replicates. For P=50 I have manage to do 50 replicates. Thanks
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