On Thu, 2005-06-09 at 09:26 -0700, Hai Lin wrote: > Dear R users: > > I am trying to add a label on axis(4) but I don't find > any reference in R archives. Could you please help me > out? > > Thanks in advance. > > The followings are the data set and what I have done: > > Sample data: > > time y1 y2 > 2 9 24.396 > 4 7.667 19.082 > 10 4.667 73.984 > > Commands: > plot(time,y1,type='l',col='red',ylab="Relative > levels", xlab="Age of Mice",ylim=c(0,20)) > points(time,y1 col="red", pch=19) > > op <-par(new=T) > plot(time,y2,type='l', > col='green',axes=F,xlab="",ylab="", ylim=c(0,80)) > points(time,y2,col='green',pch=24) > axis(4)
There are two options: First, use: par(mar = c(5, 4, 4, 5)) before your first plot to increase the margin on the right hand side for the second Y axis label. You can further adjust these as you may require. See ?par for more information. Then, after the second plot: 1. Use mtext() as follows: mtext(4, text = "This is Y Axis 2", line = 3) Note however that the text is facing outward. Adjust the 'line' argument to move the text in or out as you need. 2. Use text() as follows: text(11.5, 40, "This is Y Axis 2", srt = 270, xpd = TRUE) This enables you to place the text outside the plot region (xpd = TRUE) and rotate it so that it is facing inward. Adjust the x and y positions as you need. See ?mtext and ?text for more information. HTH, Marc Schwartz ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
