Simplifying complicated expressions
- To: mathgroup at smc.vnet.net
- Subject: [mg110161] Simplifying complicated expressions
- From: "S. B. Gray" <stevebg at ROADRUNNER.COM>
- Date: Sat, 5 Jun 2010 07:31:08 -0400 (EDT)
- Reply-to: stevebg at ROADRUNNER.COM
Suppose I have a long complex expression in which terms like
(x^2+y^3-x^2y^2+Sqrt[z3+y2]) (for a simple example) appear many times
along with various powers and the reciprocals of it, etc. To make the
expression comprehensible and to make the computation faster, I would
like to substitute say "f1xyz" for it everywhere it appears. The normal
/. and -> substitutions and patterns are not adequate for this. Of
course at evaluation time I want to compute f1xyz only once and not have
the final formula revert to the original variables. How do I prevent that?
Also a welcome addition to Mathematica would be the ability to find these
repeated expressions automatically and put them in, because doing it
manually is very error-prone and slow.
Tips will be appreciated!
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