R help - Nov 2002 - Specifying line types

platform i686-pc-linux-gnu
arch     i686             
os       linux-gnu        
system   i686, linux-gnu  
status                    
major    1                
minor    6.1              
year     2002             
month    11               
day      01               
language R  

I wish to make a vector of line types something like c("21",
"32")
which is simple enough to do.  But if I want to have a continuous line
part of that vector, I'd have thought "40" would produce a blank
space
of zero length thereby achieving the desired effect.  Not so.

Even less predictable is if I try "A0".  The result seems to be
similar to specifying "A8" (approximately).  Is that by design?

It's no surprise that lty = 1 cannot mix with lty = "32" but in
the
end, I discovered that c("21", "32", "solid") will
do what I want,
though it wasn't obvious.

Is something lacking in the documentation or just in my comprehension?

best

-- 
Patrick Connolly
HortResearch
Mt Albert
Auckland
New Zealand 
Ph: +64-9 815 4200 x 7188
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Patrick Connolly <p.connolly at hortresearch.co.nz> writes:
> I wish to make a vector of line types something like c("21",
"32")
> which is simple enough to do.  But if I want to have a continuous line
> part of that vector, I'd have thought "40" would produce a
blank space
> of zero length thereby achieving the desired effect.  Not so.
> 
> Even less predictable is if I try "A0".  The result seems to be
> similar to specifying "A8" (approximately).  Is that by design?
The source is available...

It says that (assuming we're talking about the x11 device) "0" is
solid and any other 0-nybbles (= half-bytes, hex digits) are converted
to "1" to prevent X11 from falling over.
 
> It's no surprise that lty = 1 cannot mix with lty = "32" but
in the
> end, I discovered that c("21", "32", "solid")
will do what I want,
> though it wasn't obvious.
> 
> Is something lacking in the documentation or just in my comprehension?
Well, what you ended up doing is completely documented in help(par).

The page might be clearer that 0-nybbles are undesirable, and if
any behaviour is driver-specific, the help page for the device should
probably say something about it.

-- 
   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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