On Nov 28, 2009, at 12:09 PM, Markus Häge wrote:

Hello there,

after I solved many problems in the last days with R I wanted to
complete my plot. I used
ylab=expression(paste("log(",mu,"/",cm^2,"/VS)"))
to have greek symbols and to change cm^2 to cm². Also cm^-3 I have in
another plot, but it cuts my ^2 to _ in the y-axis.

here is the code and I attach the plot:

jpeg(file="Tabh2.jpg",quality=100)
plot(Temp3,bew2log,xlab="log(T/K)",ylab=expression(paste("log(",mu,"/ cm^2/VS)")),xlim=range(c(Temp3)),cex.axis=1.5,cex.lab=1.5)
abline(reg=fitbew,lty=1)
lines(Temp3,bewt2,lty=2)
legend(1.932,2.9,c("Experiment"),pch=1,bty="n")
legend(1.9,2.88,c("Regression","Theorie"),bty="n",lty=c(1,2))
dev.off()


It would seem obvious that we cannot reproduce what you are seeing without "Temp3" or bew2log" or "fitbew", but it also seems as though some of your questions are concerning how to mix text and Greek letters in the ylab argument, for which the data is not really needed.

?plotmath
?bquote # I'm too clueless get either expression or as.expression to "work". # bquote also offers the possibility of substitution of values through .()

jpeg(file="Tabh2.jpg",quality=100);
plot(1,1, xlab="log(T/K)", ylab=bquote(log(mu/cm^2/VS)), xlim=c(-4,4), cex.axis=1, cex.lab=1)
legend(1.932,2.9,c("Experiment"),pch=1,bty="n")
legend(1.9,2.88,c("Regression","Theorie"),bty="n",lty=c(1,2));
dev.off()

Somewhere I have to add a bigger plot-region... and I don't know the
code.

You need bigger margins so the superscripted exponents do not get cut off on the left side, not bigger plot regions, that is if you want cex.lab > 1. To do that you need to reset the margins for the device _after_ the device is opened.

jpeg(file="Tabh2.jpg",quality=100);   par(mar=c(5, 5, 4, 2) + 0.1)
plot(1,1,xlab="log(T/K)",ylab=bquote(log(mu/cm^2/VS)), xlim=c(-4,4), cex.axis=1.5, cex.lab=1.5)
legend(1.932,2.9,c("Experiment"),pch=1,bty="n")
legend(1.9,2.88,c("Regression","Theorie"),bty="n",lty=c(1,2));
dev.off()

I am on a Mac, so it is possible that you will not get the satisfactory result I am viewing at the moment.

--
David.

> sessionInfo()
R version 2.10.0 Patched (2009-10-29 r50258)
x86_64-apple-darwin9.8.0

locale:
[1] en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] splines stats graphics grDevices utils datasets methods base

other attached packages:
[1] sp_0.9-44 ks_1.6.8 mvtnorm_0.9-8 KernSmooth_2.23-3 [5] lme4_0.999375-32 Matrix_0.999375-31 plm_1.2-1 sandwich_2.2-1 [9] zoo_1.5-8 MASS_7.3-3 Formula_0.2-0 kinship_1.1.0-23
[13] lattice_0.17-26    nlme_3.1-96        survival_2.35-7

loaded via a namespace (and not attached):
[1] grid_2.10.0  tools_2.10.0





thanks

Markus
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David Winsemius, MD
Heritage Laboratories
West Hartford, CT

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and provide commented, minimal, self-contained, reproducible code.

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