Error with strwidth after lattice graphic drawn - R-help

Sat, Nov 20, 2004 7:37 AM #

In

platform i386-pc-linux-gnu
arch     i386
os       linux-gnu
system   i386, linux-gnu
status
major    2
minor    0.1
year     2004
month    11
day      15
language R

I'm getting an error when using strwidth after a lattice graphic is drawn:

library(lattice)
xyplot(runif(20) ~ runif(20))
strwidth('xxx')

Error in strwidth("xxx") : invalid graphics state

Any help appreciated.  I have version 2.0.1 of grid and version 0.10-14 
of lattice.

Frank E Harrell Jr   Professor and Chair           School of Medicine
                      Department of Biostatistics   Vanderbilt University

Brian Ripley

Sat, Nov 20, 2004 9:56 AM #

On Sat, 20 Nov 2004, Frank E Harrell Jr wrote:

The advice is `don't do that'!

strwidth() is a base graphics command, and will only work if a device is 
currently plotting base graphics.  Lattice is built on grid, which has
stringWidth().

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

Uwe Ligges

Sat, Nov 20, 2004 10:19 AM #

Prof Brian Ripley wrote:

... and convertWidth() is useful to display stuff afterwards in an 
interpretable way  ...

Uwe Ligges

Frank E Harrell Jr

Sun, Nov 21, 2004 7:52 AM #

Uwe Ligges wrote:

Thanks Uwe and Brian.  Before the latest versions, grid would let me use 
ordinary graphics functions to deal with the currently rendered plot 
after I did par(usr=c(0,1,0,1)), so I was lazy.  I changed my code to 
use specific grid functions.

Frank E Harrell Jr   Professor and Chair           School of Medicine
                      Department of Biostatistics   Vanderbilt University