I'm runnig many simulations with one only different paramater value. The reason is to generate statistical data. I have an account on the super-computer center shown in the following web page: http://harpo.wustl.edu/hardware.html There seems to be a Linux system (SGI Altix) but because of the way my account was set up my entry is on Harpo which runs Irix. I'll be runnin on batch so I do not know if this is important at all. I'd like to be able to recompile and run my simulation (developed on SuSE) with the least possible discomfort from s/w environment incompatibilities ... There is no GNU Scientific Library which I need. My question for you is: What should I ask this center administrator for ? They are amenable to install some s/w upon user request ... In the case GSL cannot run/be installed then is ther any replacement for a good Random Number Generator that you'd advice ? I like SuSE and am very gratefull to all generous people that have been helping me regularly. The only drawback is when it comes to porting my project to some other platform ... Thank you in advance for your help. maura Thank you for clarifying my ideas. Maura