Le 11.08.2005 00:59, array chip a écrit : >Thanks for the suggestion! It works in a way that the >entire graph window is in the background color, is >there a way to only have the plotting area (i.e. the >area within the axis box in the background color, but >leave the area outside the axes to be unchanged >(white)? > >Thanks! > > > You need to learn how to use par('usr') and argument add in image. demo('graphics') is one way to learn or look at graph 8 on r graph gallery
R> image(matrix(c(1,2,NA, 1),2, 2)) R> usr <- par('usr') R> rect(usr[1], usr[3], usr[2], usr[4], col="cornsilk") R> image(matrix(c(1,2,NA, 1),2, 2),add=TRUE) Romain >--- Prof Brian Ripley <[EMAIL PROTECTED]> wrote: > > > >>On Wed, 10 Aug 2005, someone needing to conceal his >>real name wrote: >> >> >> >>>Hi, I am using image() function to plot a matrix >>> >>> >>which >> >> >>>has some missing valuies (NA). It looks like, by >>>default, missing values were drawn in white color, >>> >>> >>How >> >> >>>can I change that into a different color, say a >>> >>> >>gray >> >> >>>color? I tried to use bg='gray' argument with no >>> >>> >>luck. >> >> >>>Anyone has a suggestion? >>> >>> >>They are not drawn in white: in fact they are not >>drawn at all, so the >>current background (or if transparent, the canvas) >>is what you see. >> >> >> >>>par(bg="yellow") >>>image(matrix(c(1,2,NA, 1),2, 2)) >>> >>> >>works, for example. >> >>-- >>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 >> >> -- visit the R Graph Gallery : http://addictedtor.free.fr/graphiques ~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~ ~~~~~~ Romain FRANCOIS - http://addictedtor.free.fr ~~~~~~ ~~~~ Etudiant ISUP - CS3 - Industrie et Services ~~~~ ~~ http://www.isup.cicrp.jussieu.fr/ ~~ ~~~~ Stagiaire INRIA Futurs - Equipe SELECT ~~~~ ~~~~~~ http://www.inria.fr/recherche/equipes/select.fr.html ~~~~~~ ~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~ ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html