using less stack

I have stack problems: my program uses too much stack. I suspect, from removing bits of code, that it's due to a foldr in my program. If I use foldr or foldl on a long list (eg >500 bulky elements for a 3M stack), is this likely to be filling the stack? What is it that gets stored on the stack? If so, is there an obvious refactoring of the fold to use? Amanda -- Amanda Clare http://users.aber.ac.uk/ajc99/ Tel: +44 (0)1970 621787 Fax: +44 (0)1970 622455 Dept. of Computer Science, University of Wales, Aberystwyth, SY23 3DB