- To: mathgroup at christensen.cybernetics.net
- Subject: [mg1496] question
- From: "Richard Conn Henry" <rch at msx4.pha.jhu.edu>
- Date: Mon, 19 Jun 1995 01:56:12 -0400
Steve, you were kind enough to supply me with information on MathTensor, and I have ordered a copy of the book and when I have examined it I may well order MathTensor. Thanks. I have a question; a general question about Mathematica. If you can answer it, obviously I would appreciate it. If you don't know the answer, can you give me an email address that would result in a useful answer? Here's the question: result= a b c d a,b,c,d are long algebraic expressions, but one of them, d, often is zero. Even then, Mathematica grinds away wasting time calculating a,b, and c, quite uselessly. If I switch to result= d a b c will that fix it? Or how? (I don't just try it because its buried in complex code and involving large numbers of such cases; I don't want to change the code unless I am assurred it is going to shorten calculations substantially.) Thanks for any help you can provide.