[R] background colors in image()

[array chip]

Romain,

Thanks for the code. It worked perfectly!



--- Romain Francois <francoisromain at free.fr> wrote:

> Le 11.08.2005 00:59, array chip a écrit :
> 
> >Thanks for the suggestion! It works in a way that
> the
> >entire graph window is in the background color, is
> >there a way to only have the plotting area (i.e.
> the
> >area within the axis box in the background color,
> but
> >leave the area outside the axes to be unchanged
> >(white)?
> >
> >Thanks!
> >
> >  
> >
> You need to learn how to use par('usr') and argument
> add in image.
> demo('graphics') is one way to learn or look at
> graph 8 on r graph gallery
> 
> R> image(matrix(c(1,2,NA, 1),2, 2))
> R> usr <- par('usr')
> R> rect(usr[1], usr[3], usr[2], usr[4],
> col="cornsilk")
> R> image(matrix(c(1,2,NA, 1),2, 2),add=TRUE)
> 
> Romain
> 
> >--- Prof Brian Ripley <ripley at stats.ox.ac.uk>
> wrote:
> >
> >  
> >
> >>On Wed, 10 Aug 2005, someone needing to conceal
> his
> >>real name wrote:
> >>
> >>    
> >>
> >>>Hi, I am using image() function to plot a matrix
> >>>      
> >>>
> >>which
> >>    
> >>
> >>>has some missing valuies (NA). It looks like, by
> >>>default, missing values were drawn in white
> color,
> >>>      
> >>>
> >>How
> >>    
> >>
> >>>can I change that into a different color, say a
> >>>      
> >>>
> >>gray
> >>    
> >>
> >>>color? I tried to use bg='gray' argument with no
> >>>      
> >>>
> >>luck.
> >>    
> >>
> >>>Anyone has a suggestion?
> >>>      
> >>>
> >>They are not drawn in white: in fact they are not
> >>drawn at all, so the 
> >>current background (or if transparent, the canvas)
> >>is what you see.
> >>
> >>    
> >>
> >>>par(bg="yellow")
> >>>image(matrix(c(1,2,NA, 1),2, 2))
> >>>      
> >>>
> >>works, for example.
> >>
> >>-- 
> >>Brian D. Ripley,                 
> >>ripley at stats.ox.ac.uk
> >>Professor of Applied Statistics, 
> >>http://www.stats.ox.ac.uk/~ripley/
> >>University of Oxford,             Tel:  +44 1865
> >>272861 (self)
> >>1 South Parks Road,                     +44 1865
> >>272866 (PA)
> >>Oxford OX1 3TG, UK                Fax:  +44 1865
> >>272595
> >>    
> >>
> 
> -- 
> visit the R Graph Gallery :
> http://addictedtor.free.fr/graphiques
> ~~~~~~~~
>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> ~~~~~~~~
> ~~~~~~      Romain FRANCOIS -
> http://addictedtor.free.fr         ~~~~~~
> ~~~~        Etudiant  ISUP - CS3 - Industrie et
> Services           ~~~~
> ~~                http://www.isup.cicrp.jussieu.fr/ 
>                 ~~
> ~~~~           Stagiaire INRIA Futurs - Equipe
> SELECT              ~~~~
> ~~~~~~  
> http://www.inria.fr/recherche/equipes/select.fr.html
>    ~~~~~~
> ~~~~~~~~
>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> ~~~~~~~~
> 
>