Sean Breheny wrote: > Olin is mostly right, but I think he means to say "delta function". > Gamma function is an extension of factorial to non-integers. Oops, yes I meant delta, more specifically the Dirac delta function. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .