Thanks a lot for your prompt reply. As I have used SAS for many years, it is also my first time to have such problem. I also have no idea what has been chenged in our system. The staff at our school computer center in fact could not figure out what happened. Regarding the out-of-memory problem, I did ever edited the codes and unfortunately, like you exppected, it moved the error to another line of the problem. I even tried to release some memory and still, it didn't work. That is why I have been struggling for such a log time. Another interesting thing is that I submitted the same SAS program on a computer with window 7. Everything works well without memory problem, even with the function CHOOSE. So, no solution, right? Anyway, I still appreciate your response. Oh, by the way, as I have read through your book and started using IML Studio for a while, I have a question in mind. Can IML Studio work together with some macro codes, like we ususally do in regular IML (PROC IML)? Thank you very much!! Vivian
... View more