[R] User defined axis on image plots

[Joerg Maeder]

hello,

for my example i used the following datas

z <- matrix(runif(20),5,4) #random datas
x <- c(1:nrow(z)); y <- (1:ncol(z))
xs <- letters[1:nrow(z)] # for the text labels

image(x,y,z,xaxt='n') # with xaxt='n' R doesn't write the x-axis
# now you can do it manually
text(x,par()$usr[3],xs,xpd=T,srt=90,adj=2) 
# par()$usr[3] gives the lowest y-value
# xpd=T allows printing ouside the inner region of the image
# srt=90 string rotation
# adj=2 the strings are adjusted at the rigth side and have a small
space to the defined place
#   adj=1 wouold adjust rigth without space, adj=.05 center adj=0 left
and so on
# you can do the same thing with the y-axis (yaxt='n', par()$usr[1] but
still xpd!)

tip: have a look to the help of par, there are many useful things.

gruess

joerg

Mark Scarr wrote:
> 
> Hi All,
> 
> As a newbie to R I have the following question, which I couldn't
> find an answer to in the documentation.
> 
> I have an x, y, z image plot of some data, where x and y are vectors
> of the form x = c(1:nrow(z)), y = (1:ncol(z)). As a result this places
> integer values on the X-axis, whereas they are in fact dates. I have
> another string vector of dates which I would like to use on the X-axis
> instead, suitably spaced and preferably vertical (rather than horizontal).
> 
> Any help would be most appreciated,
> 
> Thanks
> 
> Mark.
> 
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-- 
    Joerg Maeder             IACETH              INSTITUTE
   PhD Student                              FOR ATMOSPHERIC 
  Phone: +41 1 633 36 25                 AND CLIMATE SCIENCE
 Fax: +41 1 633 10 58                  ETH ZÜRICH Switzerland
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