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MathGroup Archive 2005

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Re: Applying function to nested lists

  • To: mathgroup at smc.vnet.net
  • Subject: [mg57959] Re: [mg57883] Applying function to nested lists
  • From: János <janos.lobb at yale.edu>
  • Date: Tue, 14 Jun 2005 05:10:23 -0400 (EDT)
  • References: <200506110735.DAA16848@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

On Jun 11, 2005, at 3:35 AM, Kerry Kim wrote:

> Hello,
>
> I'm trying to get Mathematica to do the following:
>
> Suppose
> x = {{1,2,3},{{4,5,6},7,8},9}
> f = some function
>
> How can I get f applied to each element of x but with the list  
> structure
> intact?  I.e. I want something that generates:
>
> {{f[1],f[2],f[3]},{{f[4],f[5],f[6]},f[7],f[8]},f[9]}
>
> Thank you!
> -Kerry Kim
>

In[1]:=
lst = {{1, 2, 3}, {{4, 5, 6},
     7, 8}, 9}
Out[1]=
{{1, 2, 3}, {{4, 5, 6}, 7,
    8}, 9}


In[2]:=
MapAt[f, lst, Position[lst,
    _Integer]]
Out[2]=
{{f[1], f[2], f[3]},
   {{f[4], f[5], f[6]}, f[7],
    f[8]}, f[9]}

János


--------------------------------------------
f @@ # & /@ ===  f @@@


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