Re: F[f_,x_]:=f[x] ?
- To: mathgroup at smc.vnet.net
- Subject: [mg19835] Re: F[f_,x_]:=f[x] ?
- From: Paul Abbott <paul at physics.uwa.edu.au>
- Date: Sun, 19 Sep 1999 01:20:22 -0400
- Organization: University of Western Australia
- References: <7rsi9t$3im@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Patrick McLean wrote:
> What is the name of the in-built Mathematica function that plays the role
> of F in te following:
>
> F[f_,x_]:=f[x].
>
> For example,
>
> Outer[F,{f,g},{x,y}]
>
> will give:
>
> {{f[x],f[y]},{g[x],g[y]}}.
Although f at x is the prefix form of f[x] you cannot use it here. Two ideas:
[1] Use a pure function instead of F:
Outer[#1[#2] & , {f, g}, {x, y}]
[2] Use Thread and Through:
Thread /@ Through[{f, g}[{x, y}]]
Cheers,
Paul
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Paul Abbott Phone: +61-8-9380-2734
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