Thank you for these answers. I ended up modifying the ps file directly. But next time I will consider wireframe.
Nathalie Prof Brian Ripley wrote: > On Tue, 24 Jul 2007, Stephen Tucker wrote: > >> I don't know why it doesn't work but I think people generally >> recommend that > > It has never been implemented, and I believe the main reason is that > the labels are plotted at an angle other than a multiple of 90 > degrees. Not all devices can do that, and rotated plotmath text can > look quite ugly. > > And of course this _is_ documented in ?persp > > xlab, ylab, zlab: titles for the axes. N.B. These must be character > strings; expressions are not accepted. Numbers will be > coerced to character strings. > >> you use wireframe() in lattice rather than persp(), because wireframe >> is more >> customizable (the pdf document referred to in this post is pretty good): >> http://tolstoy.newcastle.edu.au/R/e2/help/07/03/12534.html >> >> Here's an example: >> >> library(lattice) >> library(reshape) >> x <- 1:5 >> y <- 1:3 >> z <- matrix(1:15,ncol=3,dimnames=list(NULL,y)) >> M <- melt(data.frame(x,z,check.names=FALSE),id=1,variable="y") >> wireframe(value~x*y,data=M, >> screen=list(z=45,x=-75), >> xlab=expression(kappa[lambda]), >> ylab=as.expression(substitute(paste(phi,"=",true,sigma), >> list(true=5))), >> zlab = "Z") >> >> [you can play around with the 'screen' argument to rotate the view, >> analogous >> to phi and theta in persp()] > > Of course, that does not rotate the labels. If unrotated labels are > acceptable, you can easily set up a new coordinate system (by > par(usr=)) and call text() to put labels where you want on that. You > can even try rotating them via srt=. > > There would be no harm in implementing this for use on devices where > it will work: a nice self-contained project for someone who would like > to learn about R internals. > > >> --- Nathalie Peyrard <[EMAIL PROTECTED]> wrote: >> >>> Hello, >>> >>> I am plotting a 3D function using persp and I would like to use greek >>> symbols in the axes labels. >>> I have found examples like this one on the web: >>> >>> >> plot(0,0,xlab=expression(kappa[lambda]),ylab=substitute(paste(phi,"=",true,sigma),list(true=5))) >> >> >>> >>> this works well with plot but not with persp: >>> with the command >>> >>> persp(M,theta = -20,phi = >>> >> 0,xlab=expression(kappa[lambda]),ylab=substitute(paste(phi,"=",true,sigma),list(true=5)),zlab >> >> >>> >>> = "Z") >>> >>> I get the labels as in toto.eps >>> >>> Any suggestion? Thanks! >>> >>> Nathalie >>> >>> -- >>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >>> INRA Toulouse - Unité de Biométrie et Intelligence Artificielle >>> Chemin de Borde-Rouge BP 52627 31326 CASTANET-TOLOSAN cedex FRANCE >>> Tel : +33(0)5.61.28.54.39 - Fax : +33(0)5.61.28.53.35 >>> Web :http://mia.toulouse.inra.fr/index.php?id=217 >>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >>> >>> >>>> ______________________________________________ >>> 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 >>> and provide commented, minimal, self-contained, reproducible code. >>> >> >> >> >> >> ____________________________________________________________________________________Ready >> >> for the edge of your seat? >> Check out tonight's top picks on Yahoo! TV. >> >> ______________________________________________ >> 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 >> and provide commented, minimal, self-contained, reproducible code. >> > ______________________________________________ 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 and provide commented, minimal, self-contained, reproducible code.
