Re: [R] Median abline how-to ?
On 08/13/2010 12:41 AM, David martin wrote: Hi, I'm newbie with R and don't really know how to add a median line to each of the groups that is not all the plot long. Here is a small working code that i have adapted for my purpose. If somebody could tell me how to draw median lines on each group and not all plot long. ctl - c(4.17,5.58,5.18,6.11,4.50,4.61,5.17,4.53,5.33,5.14) trt - c(4.81,4.17,4.41,3.59,5.87,3.83,6.03,4.89,4.32,4.69) group - gl(2,10,20, labels=c(Ctl,Trt)) weight - c(ctl, trt) ctlmed - median(weight[which(group == Ctl)]) trtmed - median(weight[which(group == Trt)]) plot.default(weight ~ group,axes=F) axis(2,col.axis = blue,las=1,cex.axis=0.7,xpd=TRUE) axis(1, labels=levels(group),at=1:length(unique(group)),las=2,cex.axis=0.7) #horizontal abline(h = ctlmed, col = blue, lwd = 2) # ?? how to make abline shorter ? abline(h = trtmed, col = red, lwd = 2) box(bty=c) Hi David, Look at ablineclip in the plotrix package. Jim __ 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] Median abline how-to ?
Hi, I'm newbie with R and don't really know how to add a median line to each of the groups that is not all the plot long. Here is a small working code that i have adapted for my purpose. If somebody could tell me how to draw median lines on each group and not all plot long. ctl - c(4.17,5.58,5.18,6.11,4.50,4.61,5.17,4.53,5.33,5.14) trt - c(4.81,4.17,4.41,3.59,5.87,3.83,6.03,4.89,4.32,4.69) group - gl(2,10,20, labels=c(Ctl,Trt)) weight - c(ctl, trt) ctlmed - median(weight[which(group == Ctl)]) trtmed - median(weight[which(group == Trt)]) plot.default(weight ~ group,axes=F) axis(2,col.axis = blue,las=1,cex.axis=0.7,xpd=TRUE) axis(1, labels=levels(group),at=1:length(unique(group)),las=2,cex.axis=0.7) #horizontal abline(h = ctlmed, col = blue, lwd = 2) # ?? how to make abline shorter ? abline(h = trtmed, col = red, lwd = 2) box(bty=c) ps: At this stage the boxplot is not interesting for me. thanks, david __ 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.
Re: [R] Median abline how-to ?
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of David martin Sent: Thursday, August 12, 2010 7:42 AM To: r-h...@stat.math.ethz.ch Subject: [R] Median abline how-to ? Hi, I'm newbie with R and don't really know how to add a median line to each of the groups that is not all the plot long. Here is a small working code that i have adapted for my purpose. If somebody could tell me how to draw median lines on each group and not all plot long. ctl - c(4.17,5.58,5.18,6.11,4.50,4.61,5.17,4.53,5.33,5.14) trt - c(4.81,4.17,4.41,3.59,5.87,3.83,6.03,4.89,4.32,4.69) group - gl(2,10,20, labels=c(Ctl,Trt)) weight - c(ctl, trt) ctlmed - median(weight[which(group == Ctl)]) trtmed - median(weight[which(group == Trt)]) plot.default(weight ~ group,axes=F) axis(2,col.axis = blue,las=1,cex.axis=0.7,xpd=TRUE) axis(1, labels=levels(group),at=1:length(unique(group)),las=2,cex.axis=0.7) You can use segments(), along with par(cxy), which gives the size of a typical plotting character in user units. E.g., w - par(cxy)[1] * 1.5 # width of pch times 1.5, half-width of median line ix - seq_len(nlevels(group)) mediansByGroup - tapply(weight, group, median) segments(x0=ix-w, x1=ix+w, y0=mediansByGroup, col=ix) Bill Dunlap Spotfire, TIBCO Software wdunlap tibco.com -Original Message- #horizontal abline(h = ctlmed, col = blue, lwd = 2) # ?? how to make abline shorter ? abline(h = trtmed, col = red, lwd = 2) box(bty=c) ps: At this stage the boxplot is not interesting for me. thanks, david __ 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.
Re: [R] Median abline how-to ?
thanks !!! On 12/08/10 17:49, William Dunlap wrote: segments(x0=ix-w, x1=ix+w, y0=mediansByGroup, col=ix) __ 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.
