Hello,
I have a series of labels that I want to place on a plot with a log
scale y axis. I want these labels to be equally spaced vertically as
seen on the plot.
I have been trying this:
ylab <- 160 - log2(1:length(labels))
but that does not seem to work (where 160 is basically the top of the plot).
Any ideas?
Thanks
--
**************************************************************
Daniel Brewer, Ph.D.
Institute of Cancer Research
Molecular Carcinogenesis
Email: daniel.brewer at icr.ac.uk
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The Institute of Cancer Research: Royal Cancer Hospital, a charitable Company
Limited by Guarantee, Registered in England under Company No. 534147 with its
Registered Office at 123 Old Brompton Road, London SW7 3RP.
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Daniel Brewer wrote:> Hello, > > I have a series of labels that I want to place on a plot with a log > scale y axis. I want these labels to be equally spaced vertically as > seen on the plot. > > I have been trying this: > > ylab <- 160 - log2(1:length(labels)) > > but that does not seem to work (where 160 is basically the top of the plot). >Hi Daniel, The method I use is to get the "real" coordinates on the plot: xylim<-par("usr") turn off the log transformation: par(ylog=FALSE) say I have three labels that I want to space: ypos<-xylim[3]+(xylim[4]-xylim[3])*c(0.2,0.5,0.8) text(xpos,ypos,c("first","second","third")) # turn the y log transformation on again if necessary par(ylog=TRUE) I assume you can work out xpos for yourself. Jim