Re: [R] Equal vertical spaced labels on plot with log="y"
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
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[R] Equal vertical spaced labels on plot with log="y"
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: [EMAIL PROTECTED]
**
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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and provide commented, minimal, self-contained, reproducible code.
