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How to avoid repeated recalculation of the same function

  • To: mathgroup at smc.vnet.net
  • Subject: [mg132668] How to avoid repeated recalculation of the same function
  • From: pgeipi10 at gmail.com
  • Date: Fri, 2 May 2014 02:18:56 -0400 (EDT)
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Hi,

I'm doing a calculaton that's purly symbolic (no graphing, numerical integration, etc.).

Suppose I have a function f[x_]:=... that's very complex to build. In fact, f[x] ends up being a manageable expression (about 30 characters) but it takes Mathematica about 30 min to build that expression.

Another function g[] uses the function f[x] and references it many times. I've discovered that g[] actually builds f[x] every time it's referenced which takes 30 minutes each time. Theoretically, Mathematica could build it once and then use the resulting expression every time it's referenced.

So how do I accomplish that? That is, how do I make it build f[x] once and then use the resulting expression when it's needed?

Thanks,


Pavel



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