There are lots of options since you did not tell us what you want on the axis (or what you have tried).
For example if you want more than 6 tick marks/labels, replace xlim=c(0, 3000) with xaxp=c(0, 3000, 12) to get labels every 250 meters instead of 500. Depending on the size of the graph window you may need to add cex.axis=.8 to reduce the text size to fit the labels in the available space. Likewise xaxp=c(0, 3000, 3) would reduce the number of labels to every 1000 meters. -----Original Message----- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of R. Michael Weylandt Sent: Thursday, October 13, 2011 1:17 PM To: lauren mcdonagh Cc: r-help@r-project.org Subject: Re: [R] x axis In your plot call, you can use xaxt = "n" to turn off the default x axis tick marks, then add axis(1, at = VARIABLEWHEREYOUWANTTICKMARKS) # If you want ticks at the x you put in, its just axis(1, at = x) to get ticks where you want them. There's also a label= argument if you want them to be labled as something other than the numbers. Hope this helps, Michael On Thu, Oct 13, 2011 at 11:42 AM, lauren mcdonagh <cleverlolli...@yahoo.ie> wrote: > Dear R users, > > I am quite desperate for help. I haven't used R in a couple of years and I'm currently finishing a masters project and running out of time to figure out my problem. I have read and tried the examples on many websites, in your forums and R Help yet still can't manage to change the x axis. I am using R 2.8.0 on windows. > > I'm sure there must be a way to do this as many people's questions seem more difficult. My problem is that I need to change the numbers on the x axis from the default. > > This is my scatter plot so far: > > >> x <- c(0, 50, 100, 250, 500, 750, 1000, 1500, 2000, 2500, 3000) >> y <- c(640, 585, 152, 85, 348, 922, 518, 82, 83, 591, 79) >> plot(y~x, type = "p", xlab = "Distance (m)", ylab = "Concentrations (mg/kg)", xlim = c(0,3000), ylim = c(0,1000), col ="black", pch = 19, sub = "Lead", font.sub = 2) >> text(0,640, "mine average", pos = 4, col = "red", cex= 0.6) >> abline(h=c(21), lty = 2, col = "green", lwd =1) >> abline(h=c(36), lty = 3, col = "blue", lwd = 1) >> abline(h=c(190), lty = 1, col ="red", lwd = 2) >> legend(1700, 1000, c("Control", "Dutch List - Optimum", "Dutch List - Action"), col = c(3,4,2), lty = c(2,3,1), cex = 0.8, lwd = c(1,1,2)) > > R automatically changes the x axis to 0, 500, 100, 1500, 2000, 2500, 3000. I've tried a few things you've already said to other people with problems but all I get is error. > > I would really appreciate some help as I've no one else to ask (the uni I've studied my masters in does not use R). > > Yours faithfully, > > Lauren. > [[alternative HTML version deleted]] > > > ______________________________________________ > 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. > > ______________________________________________ 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. ______________________________________________ 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.
