[R] Little graph questions!

[Peter Dalgaard BSA]

Uwe Ligges <ligges at statistik.uni-dortmund.de> writes:

> Paul Johnson wrote:
> > 

> > 2. Background tint in png output varies in a way I can't understand.
> > 
> > One time I set up a png device and ran the plot and saved it:
> > 
> > http://lark.cc.ukans.edu/~pauljohn/R/ExampleCode/gamma4.png
> > 
> > Another time I forgot to turn on the device, ran the plot, then used
> > dev.copy(png, file="poissonCLT",width=500,height=1000) to get:
> > 
> > http://lark.cc.ukans.edu/~pauljohn/R/ExampleCode/poissonCLT.png
> > 
> > in the poissonCLT.png, to my eye the background is light green, while in
> > the gamma4.png, it is white. DO you see it too?
> 
> 
> Works well for me (R-1.4.1, WinNT4; your version / OS?).
> You didn't specify a background color with par(bg=...) before?

I see it on Linux, although my R versions are slightly old on this
particular machine. I'll rebuild the development version and see if it
disappeared, but I don't think we touched this since 1.4.0?

> 
> > 3. In all of these examples, I have had trouble positioning text in
> > figures.  Because I don't know what the plotted values will be until the
> > model is run, it is hard to write coordinates for text(x,y,""). I
> > frequently wish there were a way to say "top left part of graph", 
> 
> 
> You get those coordinates with 
>  par("usr")
> 
> 
> > but the best i can come up with is to find the coordinates of the max or min
> > values of x and y and put the text there.
> > 
> > I have that code in the bottom of this one:
> > 
> > http://lark.cc.ukans.edu/~pauljohn/R/ExampleCode/template_poisson4.r
> > 
> > After using Axum for years, this seems a bit odd to me, but I'm willing
> > to do it, if that is what you really intend us to do.

Also, consider

plot(1)
mtext("Hello", adj=0.98, line=-1)

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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