Sequential Line Plots in R

December 7, 2010
By

(This article was first published on Guy Abel » R, and kindly contributed to R-bloggers)

I was trying to create some sequential plots today in R to analyse some MCMC simulations. I found the par(ask=TRUE) command very useful for looking at iterations of individual parameter values. Setting the ask graphical parameter to TRUE (before a for loop) allows you to update plots by clicking on the plotting device (in windows). Here is some example code to show how par(ask=TRUE) works.

xx <- rnorm(1000)
xx <- matrix(xx,10,100)
par(ask = TRUE)
plot(xx[1,], type="n", ylim=range(xx), ylab="")
for(i in 1:10){
   plot(xx[i,], ylim=range(xx), ylab="", type="l")
}

This will give the following output after each click:

If you want to keep previous plotted lines on the plot you can adapt the for loop in such a manner:

par(ask=TRUE)
plot(xx[1,], type="n", ylim=range(xx), ylab="")
for(i in 1:10){
   plot(xx[1,], ylim=range(xx), ylab="", type="l")
   for(j in 1:i){
      lines(xx[j,])
   }
}

This will give the following output after each click:


To leave a comment for the author, please follow the link and comment on his blog: Guy Abel » R.

R-bloggers.com offers daily e-mail updates about R news and tutorials on topics such as: visualization (ggplot2, Boxplots, maps, animation), programming (RStudio, Sweave, LaTeX, SQL, Eclipse, git, hadoop, Web Scraping) statistics (regression, PCA, time series, trading) and more...



If you got this far, why not subscribe for updates from the site? Choose your flavor: e-mail, twitter, RSS, or facebook...

Comments are closed.