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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: [mg76743] Re: How to subtract two sets of data for a ListPlot
  • From: Ray Koopman <koopman at sfu.ca>
  • Date: Sat, 26 May 2007 04:48:24 -0400 (EDT)
  • References: <f36gb5$9fq$1@smc.vnet.net>

list1 - ({0,1}#&)/@list2

On May 25, 4:12 am, chuck009 <dmili... at comcast.com> wrote:
> 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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