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Re: Apply function to parts of a list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg86245] Re: Apply function to parts of a list
  • From: dh <dh at metrohm.ch>
  • Date: Fri, 7 Mar 2008 02:24:21 -0500 (EST)
  • References: <fqo8pn$svq$1@smc.vnet.net>


Hi,

try e.g.:

{2,1}&/@ data

hope thsi helps, Daniel



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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