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Re: Apply function to parts of a list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg86254] Re: Apply function to parts of a list
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Fri, 7 Mar 2008 02:26:03 -0500 (EST)
  • References: <fqo8pn$svq$1@smc.vnet.net>

Hi,

data /. {x_, y_} :> {2*x, y}

?
or
{2,1}*# & /@ data

??

Regards
   Jens

guerom00 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.
> 


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