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MathGroup Archive 2006

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Re: Function argument

  • To: mathgroup at
  • Subject: [mg66987] Re: Function argument
  • From: "Yaroslav Bulatov" <yaroslavvb at>
  • Date: Tue, 6 Jun 2006 06:27:39 -0400 (EDT)
  • References: <e60o3q$g5s$>
  • Sender: owner-wri-mathgroup at

g[a_, b_] := Evaluate[b][a]
g[Pi, Sin]
--> 0

Bonny wrote:
> I would like to define a function g that evaluates another function f at a
> given value. That is,
> g[a, f[x]] := f[a]
> For example, I might want the function f[x]=ax^2+bx+c to be evaluated at x=1
> and get the result a+b+c. That is,
> g[1, ax^2+bx+c] should evaluate to a+b+c.
> Again, I might want the function f[x]=Sin[x] to be evaluated at x=pi and get
> the result 0. That is,
> g[pi, Sin[x]] should evaluate to 0.
> Is there a way to accomplish this in Mathematica? Any help would be
> appreciated.
> Thanks,
> Bonny.

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