Re: How do I manipulate that data?
- To: mathgroup at smc.vnet.net
- Subject: [mg22451] Re: How do I manipulate that data?
- From: Brian Higgins <bghiggins at ucdavis.edu>
- Date: Sat, 4 Mar 2000 02:26:25 -0500 (EST)
- References: <89iaoe$msi@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
In article <89iaoe$msi at smc.vnet.net>,
mark griggs <markgriggs at sc.rr.com> wrote:
> Hello all,
> I have a data file called data.txt. It consists of 2 columns of
> data. I am able to read with
> data = ReadList["/home/mark/data.txt", {Real, Real}]; I let the
first
> column represent x and the second represent y. Then I plot y vs. x
> with ListPlot[data]. My problem is that I need to plot y^2 vs. x.
> So, how can I square all the y terms?
>
> regards
>
> mark
>
Mark,
Here is one way to do it using Map:
data = {{1, 2}, {2, 3}, {3, 4}};
Map[{#[[1]], #[[2]]^2} &, data]
{{1, 4}, {2, 9}, {3, 16}}
Brian
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