On Mon, 20 Feb 2006, Paul Murrell wrote: [...]
>> >> x11() >> >> plot(rnorm(10)) >> >> dev.print(png) >> Paul> Error in dev.copy(device = function (filename = "Rplot%03d.png", >> width = >> Paul> 480, : >> Paul> invalid graphics state > I think the problem is that the width and height of the PNG device is > being taken (without regard for units) from the X11 device. So > approximately 7 inches square screen window gets drawn into > approximately 7 *pixel* square PNG file and (understandably) R complains > that there is not enough room for the plot. Yes, that it how it is documented to work. > Another workaround is something like ... > > dev.print(png, width=480, height=480) (Just one will do if you want to preserve the aspect ratio.) > ... and a fix requires making dev.print() smarter so that it figures out > that it needs to convert width/height from inches to pixels. I don't think there is a way to do that unambiguously (there is no standard way to do the conversion), and in any case dev.print() was passed a function, not the name of a function, and so does not in general know how it behaves (and your 'png' need not be R's png()). All we can do is to re-emphasize this on the help page, and add a warning if a known bitmap device is detected (possibly inaccurately) by name. BTW, I think it was perverse to call dev.print() except to do printing. -- Brian D. Ripley, [EMAIL PROTECTED] 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 ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
