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 >