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Re: Apply function to parts of a list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg86258] Re: Apply function to parts of a list
  • From: "jwmerrill at gmail.com" <jwmerrill at gmail.com>
  • Date: Fri, 7 Mar 2008 02:26:48 -0500 (EST)
  • References: <fqo8pn$svq$1@smc.vnet.net>

On Mar 6, 3:08 am, guerom00 <guero... at gmail.com> wrote:
> 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.

Maybe an improvement:

Transpose[{2,1}*Transpose[data]]

JM


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