Hi All, Attached is the code for generating C/C++ code from a GiNaC expression that pulls out subexpressions and declares them up front so that they only have to be evaluated once.  The .hh file has documentation and a simple usage example. I hope this is useful. I used it to reduce 50MB of code to under 300K and improved the running time dramatically. -Doug Support NPR 20 seconds at a time. www.twentysecondsatatime.org