Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2007
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2007

[Date Index] [Thread Index] [Author Index]

Search the Archive

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

  • To: mathgroup at smc.vnet.net
  • Subject: [mg76721] Re: [mg76672] How to subtract two sets of data for a ListPlot
  • From: János <janos.lobb at yale.edu>
  • Date: Sat, 26 May 2007 04:37:00 -0400 (EDT)
  • References: <200705251045.GAA08313@smc.vnet.net>

On May 25, 2007, at 6:45 AM, chuck009 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!

Here is a newbie approach:

In[5]:=
newlist = Table[
    {list1[[i,1]],
     list1[[i,2]] - list2[[i,
       2]]}, {i, 1,
     Length[list1]}]
Out[5]=
{{1, 0}, {2, -2}, {3, -6}}

J=E1nos


----------------------------------------------
Trying to argue with a politician is like lifting up the head of a 
corpse.
(S. Lem: His Master Voice)



  • Prev by Date: Re: exporting graphics
  • Next by Date: Re: Stopping Automatic Animation in v6
  • Previous by thread: Re: How to subtract two sets of data for a ListPlot
  • Next by thread: Re: How to subtract two sets of data for a ListPlot