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MathGroup Archive 2002

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RE: passing functions as parameters

  • To: mathgroup at smc.vnet.net
  • Subject: [mg34003] RE: [mg33988] passing functions as parameters
  • From: "David Park" <djmp at earthlink.net>
  • Date: Fri, 26 Apr 2002 03:27:25 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

There is no problem in passing functions to a routine. It can be done
directly.

f1[x_] := x^3 - x + 1
f2[x_] := -x

g[x_, y_, f_] := If[f[x] > f[y], "Done", "Waiting"]

g[2, 3, f1]
Waiting

g[2, 3, f2]
Done

g[2, 3, Sin]
Done

Or you can simply pass a pure function without writing a definition in
advanced.

g[2, 3, #^2 + 2Sin[#] &]
Waiting

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/

> From: GoranG [mailto:icmc2MAKNUTIOVO at pop.tel.hr]
To: mathgroup at smc.vnet.net
>
>
> How would one pass one function to another?
>
> I need to be able to define functions in the following fashion:
>
> f[x_]:=x^3-x+1
>
> g[x_,y_,somefunction?]:=If[somefunction[x]>somefunction[y],"Done",
> "Waiting")
>
> to be able to later on evaluate
>
> g[2.,3., f?]
>
> I have tried couple of paths with no success and would really like to
> avoid using global function in function g.
>
> All the best...
>
>



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