R help - Apr 2006 - lwd - Windows

Dear all

Is there a way or trick in windows to plot a line width that is not an 
integer i.e 1.5?
I am aware that the documentation for window devices states "Line widths as
controlled by par(lwd=) are in multiples of the pixel size, and multiples < 
1 are silently converted to 1" but I was wondering if there is a workaround
this.

Also, IMHO the documentation for lwd in par may need some clarification 
since it states:
"The line width, a positive number, defaulting to 1. The interpretation is 
device-specific, and some devices do not implement line widths less than 
one."  Perhaps it would be useful for the users to describe the behavior
for
the most important devices, and also to state that the number is an integer 
(at least for windows) and not just a positive number?


version

platform i386-pc-mingw32
arch     i386
os       mingw32
system   i386, mingw32
status
major    2
minor    2.1
year     2005
month    12
day      20
svn rev  36812
language R


Thanks

Francisco

On Wed, 26 Apr 2006, Francisco J. Zagmutt wrote:
> Dear all
>
> Is there a way or trick in windows to plot a line width that is not an
> integer i.e 1.5?
> I am aware that the documentation for window devices states "Line
widths as
> controlled by par(lwd=) are in multiples of the pixel size, and multiples
<
> 1 are silently converted to 1" but I was wondering if there is a
workaround
> this.
That's not what it says in R 2.3.0 (nor in my copy of 2.2.1)!  ?windows 
says

      Line widths as controlled by 'par(lwd=)' are in multiples of
      1/96inch.  Multiples less than 1 are allowed, down to one pixel
      width.
> Also, IMHO the documentation for lwd in par may need some clarification
> since it states:
> "The line width, a positive number, defaulting to 1. The
interpretation is
> device-specific, and some devices do not implement line widths less than
> one."  Perhaps it would be useful for the users to describe the
behavior for
> the most important devices, and also to state that the number is an integer
> (at least for windows) and not just a positive number?
False premise.  Please don't ask for the documentation to be changed to 
your personal misreading of it.

-- 
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