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MathGroup Archive 2000

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Re: Repeated function evaluation?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg24239] Re: Repeated function evaluation?
  • From: "Kevin J. McCann" <kevinmccann at home.com>
  • Date: Tue, 4 Jul 2000 15:22:04 -0400 (EDT)
  • References: <8jrcda$du2@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Try,

f[x_,y_] := f[x,y]=Module[{ }, . . .]

This stores previous evaluations. Note that it is costing you memory when
you do this; so, you could run into trouble.

Kevin

"AES" <siegman at stanford.edu> wrote in message
news:8jrcda$du2 at smc.vnet.net...
> Suppose I have a function  f[x_,y_] := Module[{ }, . . .]  where the
> module is fairly time-consuming to evaluate.
>
> If I call this function a second time in a given notebook using
> identical values of the arguments  x  and  y , is Mathematica smart
> enough the second time around to recognize that it's already evaluated
> the function once for those arguments, and use a stored value?
>
> Or, if I want to use the values of this function for a given range of
> arguments multiple times (e.g., replotting the values in different
> ways), do I need to do something like
>
>    Do[ ff[x,y] = f[x,y], {x, x1, x2}, {y, y1, y2} ]
>
> and use the values  ff[x,y]  instead?
>
> Thanks   AES
>



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