you can't refer to an argument within a function call. Try uiw <- Saline[,3]
plotCI(x=Saline [,1],y=Saline [,2], uiw=uiw, liw=uiw, err=y, pch=21, pt.bg=par("bg"), cex=1.5, lty=1, type="o", gap=0, sfrac=0.005, xlim=c(-21,340),xaxp=c(-20,320,11), xlab="Time (min)", ylim=c(0,12), yaxp=c(0,12,11), ylab="Arterial Plasma Acetaminophen (µg/mL)", las=1, font.lab=2, add=TRUE) Cheers Joris On Sat, Jun 5, 2010 at 6:09 PM, beloitstudent <schu...@beloit.edu> wrote: > > Hello all, > > I am an undergraduate student who is having syntax issues trying to get > error bars on my graph. > > This is the data, which I assigned the name "Saline" to. > Time Average SEM > 1 -20 0.000000 0.0000000 > 2 > 3 30 0.000000 0.0000000 > 4 45 3.227902 0.7462524 > 5 60 5.066664 1.1623944 > 6 80 6.107491 1.5027762 > 7 110 6.968231 1.3799637 > 8 140 7.325713 1.2282053 > 9 200 7.875194 1.1185175 > 10 260 6.513927 0.5386359 > 11 320 4.204342 0.6855906 > > This is the command that I typed in to get my error bars. > > plotCI(x=Saline [,1],y=Saline [,2], uiw=Saline [,3], liw=uiw, err=y, pch=21, > pt.bg=par("bg"), cex=1.5, lty=1, type="o", gap=0, sfrac=0.005, > xlim=c(-21,340),xaxp=c(-20,320,11), xlab="Time (min)", ylim=c(0,12), > yaxp=c(0,12,11), ylab="Arterial Plasma Acetaminophen (µg/mL)", las=1, > font.lab=2, add=TRUE) > > And this is the error message I keep getting > Error in plotCI(x = Saline[, 1], y = Saline[, 2], uiw = Saline[, 3], liw = > uiw, : > object 'uiw' not found > In addition: Warning message: > In if (err == "y") z <- y else z <- x : > the condition has length > 1 and only the first element will be used > > Now, to me, the command seems correct. > I want the error bars to show up where the points on my graph are...so the x > coordinates should be my time (aka Saline [1]) and the y coordinates should > be my Averages (aka Saline [2]) and my upper and lower limits to my > confidence interval should be the SEM from Saline [3], but something is > wrong with this and I cannot figure out what it is. If anyone has > suggestions I would be very grateful. Thanks for your help! > > beloitstudent > -- > View this message in context: > http://r.789695.n4.nabble.com/Error-Bar-Issues-tp2244335p2244335.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@r-project.org 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. > -- Ghent University Faculty of Bioscience Engineering Department of Applied mathematics, biometrics and process control tel : +32 9 264 59 87 joris.m...@ugent.be ------------------------------- Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php ______________________________________________ R-help@r-project.org 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.