       Re: Function argument

• To: mathgroup at smc.vnet.net
• Subject: [mg66984] Re: Function argument
• From: bghiggins at ucdavis.edu
• Date: Tue, 6 Jun 2006 06:27:26 -0400 (EDT)
• References: <e60o3q\$g5s\$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```Bonny, Try this:

In:=
f1[x_] := a*x^2 + b*x + c
f2[x_] := Sin[x]
g[a_, f_] := f[a]

In:=g[1,f1]

Out=a+b+c

In:=g[Pi,f2]

Out=0

Hope this helps,
Cheers,

Brian

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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