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MathGroup Archive 2003

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Re: a little more complex list operation

  • To: mathgroup at smc.vnet.net
  • Subject: [mg40259] Re: a little more complex list operation
  • From: atelesforos at hotmail.com (Orestis Vantzos)
  • Date: Fri, 28 Mar 2003 04:31:25 -0500 (EST)
  • References: <b5uoth$lks$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

The principle is simple: write the element-operation as a pure
function and map it on the list:
{f[#[[1]]],g[#[[2]]]}& /@ data

Alternatively you can 'apply' the function to the elements of the
list:
{f[#1],g[#2]}& @@@ data

Orestis

Nathan Moore <nmoore at physics.umn.edu> wrote in message news:<b5uoth$lks$1 at smc.vnet.net>...
> Thanks very much for all the previous replies.  Another simple question -
> though I guess this will require more complex syntax.  Suppose I have the
> list,
> 
> data = {{x1,y1},{x2,y2},{x3,y3}}
> 
> and I want to produce the result (for fitting/plotting)
> 
> data2 = {{f[x1],g[y1]},{f[x2],g[y2]},{f[x3],g[y3]}}
> 
> I assume that if there was only one transform I wanted to apply, f[x],
> then I could say
> 	data2 = f[data]
> but how about this more complicated transform with functions f and g?
> 
> again thanks!  Your replies have been very helpful!
> 
> Nathan Moore, University of Minnesota Physics


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