i got an example from here http://osdir.com/ml/mathematics.maxima.general/2003-03/msg00238.html this command is not working : declare_weights(i,0,j,0,k,0); is it no more working in maxima ? regards -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.math.utexas.edu/pipermail/maxima/attachments/20081020/fdb204b6/attachment.htm