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MathGroup Archive 2003

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Re: Caching of values and delayed sets

  • To: mathgroup at smc.vnet.net
  • Subject: [mg39733] Re: [mg39668] Caching of values and delayed sets
  • From: Kirk Reinholtz <kirk.reinholtz at jpl.nasa.gov>
  • Date: Mon, 3 Mar 2003 23:51:25 -0500 (EST)
  • References: <200303010747.CAA09846@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

C := C = (Pause[10];42);

Nafod40 wrote:
> 
> Hola Amigos,
> 
> I have a variable A that depends via a delayed set on variables B1
> through B1000 that each depend via delayed set on variable C and other
> a mixture of the other B's, which delayed set depends on some slow to
> calculate function C:= slow[ ]. If you explode out the tree view of A
> symbolically, the variable C might appear 5000 times in a messy
> acyclic dependency graph.
> 
> How do I inject some smarts, so that, when asking for the value of A,
> I only evaluate C:=slow[ ] once, and cache it and use the cached value
> for every other time that I need C?


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