Hi. Sorry (esp to Uwe for the repeated messages!) Here is the data and my code in full. Thanks for the help.
Data. Day Ym1Imp Ym1sham Semimp Semsham 0 5.78 5.78 1.22 1.36 1 44.36 42.1 16.26 18.83 3 38.39 14.66 18.02 2.86 5 57.76 1.03 15.28 0.29 7 72.93 2.71 18.6 1.06 10 48.57 4.61 11.26 5.21 14 74.08 1.53 9.66 0.11 21 73.86 0.14 7.2 0.02 Code ym<- read.table("ym1expression.csv", header=T, sep="\t", quote="\"") #read in ym data attach(ym)# make data visible to R par(mar=c(5,5,4,5),las=1, xpd=NA) x<- c(0,1,3,5,7,10,14,21) plot(Day, Ym1Imp, ylim=c(0,100), type="b", bty="l", main="Ym1 Expression", cex=1.3, xaxt="n", yaxt="n") #plot implant data axis(side=1, at=c(0,1,3,5,7,10,14,21), labels=c(0,1,3,5,7,10,14,21)) # label x axis mtext("Day", side =1, at=10, line=3, cex=1.2) # title x axis mtext("AU", side=2, at=50, line=3, cex=1.2)# y axis title axis(side=2, at=c(0, 25, 50, 75, 100), labels=expression("0", "25", "50", "75", "100")) # label y axis arrows(x, Ym1Imp-Semimp, x, Ym1Imp+Semimp, code=3, angle=90, length=0.1)# place error bars points(Day, Ym1sham, type="b", pch=16, cex=1.3)# plot sham data arrows(x, Ym1sham-Semsham, x, Ym1sham+Semsham, code=3, angle=90, length=0.1)# plot sham error bars legend(20, 60, legend="Implant", pch=1, lty=1, bty="n")# implant legend legend(20, 50, legend="Sham", pch=16, lty=1, bty="n")# sham legend Iain -- Iain Gallagher Institute for Infection & Immunology Research Ashworth Laboratories Kings Buildings University of Edinburgh Edinburgh EH9 3JT UK (+44) 0131 651 3630 ______________________________________________ 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