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MathGroup Archive 2005

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Re: Re: Applying a list of functions to a list of arguments

  • To: mathgroup at smc.vnet.net
  • Subject: [mg57383] Re: [mg57325] Re: Applying a list of functions to a list of arguments
  • From: "David Park" <djmp at earthlink.net>
  • Date: Thu, 26 May 2005 04:31:26 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Hi Jens,

f = {f1, f2, f3};
a = {a1, a2, a3};

Apply @@@ Thread[{f, {#} & /@ a}]

I guess that is supposed to be humorous, but I hope it is never the first
example in a Functional Programming class! It depends a lot on bracket
construction and even when I try to deconstruct it, it certainly doesn't
appear as an obvious path to the solution.

{#} & /@ a
Thread[{f, %}]
Apply @@@ %

But, darn if it doesn't work!

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

From: Jens-Peer Kuska [mailto:kuska at informatik.uni-leipzig.de]
To: mathgroup at smc.vnet.net


Hi,

Apply @@@ Thread[{f, {#} & /@ a}]

??

Regards

  Jens

"D M Yates" <yatesd at mac.com> schrieb im
Newsbeitrag news:d6usl9$j41$1 at smc.vnet.net...
>I have a list of functions, and a list of
>arguments:
>
> For example,
> f = {f1, f2, f3}
> a = {a1,a2,a3}
>
> I would like to return
> {f1[a1],f2[a2],f3[a3]}
>
> I thought this should easy, but am stumped.
> Obviously the lists are of
> equal, but arbitrary length, and the arguments
> may or may not be atomic
> expressions. In my particular case, the
> arguments are likely to be
> combinations of Real, and List[Real,...], but I
> hope this is
> irrelevant.
>
> Any suggestions?
>
> Many thanks,
>
> Derek Yates
>






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