R help - Jan 2007 - image() and nonsquare matrices

How do I draw non-square matrices with image() and get the axes right?


Try 1:

  a <- matrix(rnorm(100),20,5)
image(1:20,1:5,a,asp=1,xlab="label here")
# No good because the axes don't touch the image



Try 2:

image(1:20,1:5,a,asp=1,axes=F,xlab="label here")
axis(side=1,pos=0)
# No good because the x axis label is floating far from the x axis.



Try 3:
  image(1:20,1:5,a,asp=1,axes=F,xlab="",ylab="")
  axis(side=1,pos=0)
# No good because the x axis label is absent.


How to use image() with a non-square matrix and make axes and labels  
appear correctly?





--
Robin Hankin
Uncertainty Analyst
National Oceanography Centre, Southampton
European Way, Southampton SO14 3ZH, UK
  tel  023-8059-7743

Robin Hankin wrote:
> How do I draw non-square matrices with image() and get the axes right?
> Try 2:
> 
> image(1:20,1:5,a,asp=1,axes=F,xlab="label here")
> axis(side=1,pos=0)
> # No good because the x axis label is floating far from the x axis.
  Its only no good if your plot device isnt a similar aspect ratio to 
your plot... Resize your graphics window and your label will float around...

  Barry

Look at the "squishplot" function in the TeachingDemos package.  Does
this set of commands work for you?
> library(TeachingDemos)
> squishplot(c(0.5,20.5),c(0.5,5.5),1)
> image(1:20,1:5,a,asp=1,xlab="label here")
> box()
-- 
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at intermountainmail.org
(801) 408-8111
 
 
> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Robin Hankin
> Sent: Friday, January 12, 2007 3:13 AM
> To: RHelp help
> Subject: [R] image() and nonsquare matrices
> 
> How do I draw non-square matrices with image() and get the axes right?
> 
> 
> Try 1:
> 
>   a <- matrix(rnorm(100),20,5)
> image(1:20,1:5,a,asp=1,xlab="label here") # No good because 
> the axes don't touch the image
> 
> 
> 
> Try 2:
> 
> image(1:20,1:5,a,asp=1,axes=F,xlab="label here")
> axis(side=1,pos=0)
> # No good because the x axis label is floating far from the x axis.
> 
> 
> 
> Try 3:
>   image(1:20,1:5,a,asp=1,axes=F,xlab="",ylab="")
>   axis(side=1,pos=0)
> # No good because the x axis label is absent.
> 
> 
> How to use image() with a non-square matrix and make axes and 
> labels appear correctly?
> 
> 
> 
> 
> 
> --
> Robin Hankin
> Uncertainty Analyst
> National Oceanography Centre, Southampton European Way, 
> Southampton SO14 3ZH, UK
>   tel  023-8059-7743
> 
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