[R] postscript and lty

[Peter Dalgaard BSA]

Torsten Hothorn <Torsten.Hothorn at rzmail.uni-erlangen.de> writes:

> To the plot experts:
> 
> when creating a plot containing different lines, each with a special line
> type, it may happen that the result of 'postscript()' is not readable by
> ghostview (which may not be an R error, thus not bug report ;-). 

It's a bug alright:

0.75 setlinewidth
[ 0.00] 0 setdash <------- Invalid PostScript


> This is the case when mixing lty as 0:6 and character or even when 
> using lty as character only.
> 
> Example:
> 
> postscript("test.ps")
> plot(1:10, type="l", lty=1)   
> lines(sample(10), lty="9A1A1A")
> lines(sample(10), lty="1A6A7A")
> lines(sample(10), lty="9B")    
> lines(sample(10), lty="1F")
> legend(4,4,paste("test", 1:5), lty=c(1, "9A1A1A","1A6A7A","9B","1F"))
> dev.off()
> 

A fundamental problem here is that c(1, "9A1A1A","1A6A7A","9B","1F")
will coerce the 1 to character, and line type "1" is causing the
trouble with postscript. Simpler version of same problem is

 postscript('test.ps')
 plot(1:10,type="l",lty="1")

The workaround is 

  legend(4,4,paste("test", 1:5), lty=c("0", "9A1A1A","1A6A7A","9B","1F"))

-- 
   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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