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Apply function to parts of a list

• To: mathgroup at smc.vnet.net
• Subject: [mg86224] Apply function to parts of a list
• From: guerom00 <guerom00 at gmail.com>
• Date: Thu, 6 Mar 2008 02:59:51 -0500 (EST)

Hi all,

Very often, I find myself having datas to plot of this form :

data={{x1,y1},{x2,y2},{x3,y3}...{xn,yn}}

So, very conventional : a list of abscissa and ordinate. Now, let's say I want to multiply by 2 all my ascissa. Right now, I write :

MapAt[2*#&,data,Table[{i,1},{i,1,Length[data]}]]

It's OK but I isn't there another way to achieve this as I find this rather "involved" for such a simple thing ?

Thanks in advance.

• Follow-Ups:
  • Re: Apply function to parts of a list
    • From: Stern <nycstern@gmail.com>
  • Re: Apply function to parts of a list
    • From: Curtis Osterhoudt <cfo@lanl.gov>
  • Re: Apply function to parts of a list
    • From: "Thomas Dowling" <thomasgdowling@gmail.com>