MathGroup Archive 2003

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Caching of values and delayed sets

  • To: mathgroup at
  • Subject: [mg39668] Caching of values and delayed sets
  • From: may106 at (Nafod40)
  • Date: Sat, 1 Mar 2003 02:47:33 -0500 (EST)
  • Sender: owner-wri-mathgroup at

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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