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MathGroup Archive 2007

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Re: How to subtract two sets of data for a ListPlot

  • To: mathgroup at smc.vnet.net
  • Subject: [mg76691] Re: [mg76672] How to subtract two sets of data for a ListPlot
  • From: "Patrick Scheibe" <mai99dnn at studserv.uni-leipzig.de>
  • Date: Sat, 26 May 2007 04:21:29 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <200705251045.GAA08313@smc.vnet.net>

Hi,

when you just want to plot the data and your x-values are 1,2,3..
then you can simply write

(list1 - list2)[[All, 2]]

and you get the subtracted y-values.
ListPlot will do the rest because it assumes that your x-values are in the
order you had.

Cheers
Patrick

Am 25.05.2007, 12:45 Uhr, schrieb chuck009 <dmilioto at comcast.com>:

> Hi all.  Suppose I've calculated two sets of lists of the form for  
> example:
>
> list1={{1,1},{2,2},{3,3}};
>
> list2={{1,1},{2,4},{3,9}};
>
> What's an efficient way to create a third list with the same x-values  
> but with the y-values subtracted
>
> newlist={{1,0},{2,-2},{3,-6}};
>
> I realize I can manually subtract them in a For-loop, but I'm sure a  
> one-line command using Map or some other construct can be used as well  
> but can't figure it out.
>
> Thanks!



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