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: Sun, 5 Mar 2000 00:23:47 -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 Sent via Deja.com http://www.deja.com/ Before you buy.