The documentation is out of date (and contradictory for cex).Nowadays NULL and NA for col and font correspond to the par() values, and for cex correspond to 1.0.
So it is in fact _plotted_ in par("col"), which by default is 1.
On 20/02/2012 18:16, Peter Ruckdeschel wrote:
Am 20.02.2012 15:22, schrieb Kasper Daniel Hansen:Peter, not all devices support transparency. My guess is that you are plotting to a device which does not, but it is hard to know from your email. KasperIn the meantime Kasper and I had some mail exchange offline. @Kasper: thanks again for your explanations and hopefully it is oK for you if I put this clarifying online It seems my original subject was a bit misleading, as I am not really interested in achieving transparency (which I know is system-dependent) but rather in the behavior, that text(<some input>, col = NA) should not do anything --- or, more useful, if you have vectorized input and col is vectorized, too, the NA-coordinates are not printed (as is what I read from the help page to par() ). The non-printing behavior is achievable already with 0 color values, and with named color "transparent", but not for NA-values. This effect seems to be device independent, at least I have checked it for the windows, pdf, and jpeg devices under Windows and in the default graphics device under Linux. Any suggestions welcome, PeterOn Mon, Feb 20, 2012 at 6:09 AM, Peter Ruckdeschel <peter.ruckdesc...@itwm.fraunhofer.de> wrote:Maybe I am missing something, but according to the help page to par (section "Color Specification"), which is referred to in the help to text argument col: β"transparent"β or (integer) βNAβ is _transparent_, useful for filled areas (such as the background!), and just invisible for things like lines or text. but: col0<- as.integer(NA) is.integer(col0) ### is this coercing to "integer" necessary? plot(1:10) text(1:10, col=col0) ### text is plotted ##whereas plot(1:10) text(1:10, col="transparent") ### text is not plotted # Of course, this is not terribly urgent, as a color value of 0 also plot(1:10) text(1:10, col=0) ### text is not plotted Best, Peter ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
-- Brian D. Ripley, rip...@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 ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
