On Sun, Oct 18, 2009 at 5:42 PM, Matthieu Dubois <matth...@gmail.com> wrote: > Hi, > > the blue point is not shown simply because it is printed outside > the current plot area. If you want to use the base graphics, you > have to manually define the xlim and ylim of the plot. Legend is added > with the command "legend". > > E.g. > x=rbind(c(10,11),c(10,11)) > y=cbind(-1:0,-1:0) > plot(y,col='yellow', xlim=c(-1,11), ylim=c(-1,11)) > points(x,col='blue') > legend("topleft", c("x","y"), col=c('blue', 'yellow'), pch=1) > > This is nevertheless most easily done in ggplot2. > E.g. > library(ggplot2) > # put the whole data in a data frame > # and add a new variable to distinguish both > dat <- data.frame(rbind(x,y), var=rep(c('x','y'), each=2)) > qplot(x=X1,y=X2, colour=var, data=dat)
qplot generates a figure with some background grid. If I just want a blank background (as in plot), what options should I specify? How to specific the color like 'red' and 'blue' explicitly? I have read the review for ggplot2 book on amazon. The rates are unanimously high. I want to know how much effort I should spend to learn ggplot2 versus conventional graphics R packages. Can ggplot2 do all the graphics tasks? Is it much easier to learn than conventional graphics packages? ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.