[R] how to plot two variables in a figure using ggplot2

[John Kane]

Please have a look at
http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example and/or http://adv-r.had.co.nz/Reproducibility.html for some general suggestions on posting here. In particular have a look at dput() or do a ?dput in R for the best way to supply sample data.

To do the plot you want you will  need to reshape your data from “wide” format to “long” and then plot it with ggplot2

See ?melt in the reshape2 package for how to reshape the data.
Normally you would use the “colour” option to separately plot the two lines so something like should do it.

ggplot(mydata, aes( XX, value, colour = variable)) + some.plot.option.

John Kane
Kingston ON Canada


> -----Original Message-----
> From: jimmygao0204 at 163.com
> Sent: Tue, 15 Dec 2015 21:41:25 +0800 (CST)
> To: r-help at r-project.org
> Subject: [R] how to plot two variables in a figure using ggplot2
> 
> Hi everyone,
> 
> Now,I want to use the following data to produce a figure.But I don't know
> how to do it.Is anyone have some experiences?
> 
> X axis using variable XX and Y axis using variable OA and KA
> 
> XX OA KA
> 
> 1  1243 0.8157 0.7790
> 2  2486 0.8190 0.7829
> 3  3729 0.8278 0.7934
> 4  4972 0.8354 0.8026
> 5  6215 0.8475 0.8140
> 6  7458 0.8530 0.8224
> 7  8701 0.8668 0.8301
> 8  9944 0.8790 0.8540
> 9 11187 0.8990 0.8790
> 
> 
> Thank you very much.
> Jimmy
> 
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