Re: [Rd] Fwd: [R] size of point symbols

2009-05-29 Thread baptiste auguie
Dear Prof. Ripley and all, Thank you very much for the pointers and the always insightful comments. I'd like to add a few further comments below for the sake of discussion, On 26 May 2009, at 08:35, Prof Brian Ripley wrote: I don't know where you get your claims from. R graphics is hand

Re: [Rd] Fwd: [R] size of point symbols

2009-05-25 Thread Prof Brian Ripley
I don't know where you get your claims from. R graphics is handled internally in inches, with a device-specific mapping to pixels/points etc (which is documented for each device on its help page). This has to be done carefully, as pixels may not be square. What the meaning of pch=1:23 is in

[Rd] Fwd: [R] size of point symbols

2009-05-25 Thread baptiste auguie
Dear all, Having received no answer in r-help I'm trying r-devel (hoping this is not a stupid question). I don't understand the rationale behind the absolute sizes of the point symbols, and I couldn't find it documented (I got lost in the C code graphics.c and gave up). The example below u