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Re: Apply or Map on some parts of lists - help

  • To: mathgroup at smc.vnet.net
  • Subject: [mg115625] Re: Apply or Map on some parts of lists - help
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Sun, 16 Jan 2011 05:56:41 -0500 (EST)

f[{x_, y_}] := {x, #/3.6 &[y]};
f[x_] := x;

Map[f, data, {3}]

Or using rules

data /. {x_, y_?AtomQ} -> {x, #/3.6 &[y]}

If you have numbers, you could use NumericQ rather than AtomQ


Bob Hanlon

---- dragec <culinovic at gmail.com> wrote: 

=============
Dear,
I have

List like:

{ {{TITLE1},{{x11,y11},{x12,y12},{x13,y13},{x14,y14}}},
  {{TITLE1},{{x21,y21},{x22,y22},{x23,y23},{x24,y24}}},
  {{TITLE1},{{x31,y31},{x32,y32},{x33,y33},{x34,y34}}}
}

So, I would like to apply some function (eg. #/3.6&) to all y's.
Is there any elegant way to do this.
I Know that you know how to do this. :)

THX




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