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MathGroup Archive 1999

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

  • To: mathgroup at smc.vnet.net
  • Subject: [mg20107] Re: [mg19819] F[f_,x_]:=f[x] ?
  • From: Daniel Reeves <dreeves at eecs.umich.edu>
  • Date: Thu, 30 Sep 1999 02:43:15 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

I just stumbled upon the built-in but undocumented function Compose, which
apparently does exactly that.
Comments from Wolfram developers...?
(probably a better functionality for Compose would be the last element of
ComposeList, to be consistent with Nest and Fold)

----- FROM Patrick McLean ON 99.09.17 01:37 (Sep 17) -----

> 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]}}.
> 
> -- 
> Patrick McLean
> 
> No news is good news...
> 

--    --    --    --    --    --    --    --    --    --    --    -- 
Daniel Reeves               http://ai.eecs.umich.edu/people/dreeves/

"If at first you don't succeed -- try, try again.
Then quit.  No use being a damn fool about it."




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