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Re: F[f_,x_]:=f[x] ?

• To: mathgroup at smc.vnet.net
• Subject: [mg19886] Re: F[f_,x_]:=f[x] ?
• From: "Allan Hayes" <hay at haystack.demon.co.uk>
• Date: Sun, 19 Sep 1999 18:47:35 -0400
• References: <7rsi9t$3im@smc.vnet.net> <7s1ppu$9o4@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Tim Dellinger <tdelling at ews.uiuc.edu> wrote in message
news:7s1ppu$9o4 at smc.vnet.net...
> p_mclean at postoffice.utas.edu.au (Patrick McLean) writes:
>
> >What is the name of the in-built Mathematica function that plays the role
> >of F in te following:
>
> >F[f_,x_]:=f[x].
>
>
> I think you're looking for Apply[].
>
>
> --
> Tim Dellinger                                www.ews.uiuc.edu/~tdelling
> tdelling at uiuc.edu
>

{Apply[f, x], Apply[f, g[x]]}

{x, f[x]}

But

Apply[f, {g[x]}]

f[g[x]]

Map[f, g[x], {0}]

f[g[x]]

I notice that  Steven Skiena uses the first form in the Combinatorica
package.


--
Allan
---------------------
Allan Hayes
Mathematica Training and Consulting
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hay at haystack.demon.co.uk
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