additional axis, different scale
On 05/10/2012 09:37 PM, pannigh wrote:
Dear list, I am looking for a possibility to present results in a more graphical way by adding an axis. But I have trouble relating my data to the added axis. Imagine the following example: a<- c(10, 20, 30, 40) b<- c(50, 250, 500, 600) ba<- b/a par(las=1, mar=c(5,5,.5,5)) plot(a,b, type="b", pch=22, cex=2, col=4, lwd=2, ylim=c(0,650), xlim=c(0,45)) axis(4, at=c(seq(0,600,length=6)), lab=c(seq(0,25,length=6)), col.axis=2 ) lines(a,ba, type="b", pch=21, cex=2, col=2, lwd=2, lty=1) I want the red line to relate its values to the x-axis (a) and axis 4 (on the right) and not as usual to the x-axis (a) and the y-axis (b). This would show the tendency of the red line much clearer which now can't be seen because of the very different scaling. E.g. I want R to know that I am trying to plot the first point of the red line P1(50/5) using the x-axis and the right axis, not the y-axis on the left ect. I would like to solve this without using a factor solution like: bb<-600/25 * ba lines(a,bb, type="b", pch=21, cex=2, col=3, lwd=2, lty=1)
Hi pannigh, Have a look at twoord.plot (plotrix) Jim