Hi,
I programmed a likelihood function with 465 unknowns and trying to maximize log-likelihood using this sub-routine. As the number of unknowns are large, the sub-routine throws a note "I/O required temporary file to be open" and "Initial allocation of symbol space exhausted. You may specify SYMSIZE = option on PROC IML statement to increase its allocation for more efficiency". As suggested by the sub-routine, I increased the symsize to 30000 (max limit), still it throws the same error. I guess this happens as the symbol space is exhausted. Could anyone tell me how to resolve this and suggest an alternative so that I can estimate unknowns. Many thanks. Bhaskar