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At 23:01 on 14 January, Yasuki Arasaki wrote: > Of course the usual answer is that modern control structures > are better at doing what the computed goto was used for, but > you show a particular problem that seems not to be the case. That is my point. > So what particular *kind* of problem is it? Can you give us a > rough idea as to what the code is doing? It is accumulating contributions to multipole moments. Each set of contributions is known to be zero above a maximum rank, evaluated for each set and specified by "index" in the code. Although the higher-rank contributions are known to be zero, one doesn't want to execute the code for them, not only because it wastes cpu time but because intermediate values used in the calculation have been evaluated only for the non-zero ranks. -- Anthony Stone http://www-stone.ch.cam.ac.uk/ University Chemical Laboratory, Email: [log in to unmask] Lensfield Road, Phone: +44 1223 336375 Cambridge CB2 1EW Fax: +44 1223 336362