# [R] How can I generate line segments between two sets of points on the same graph?

From: Lloyd Lubet <lloydl_at_cybermesa.com>
Date: Mon 15 Jan 2007 - 23:56:41 GMT

I am drawing two plots on the same graphics device window as follows:

yLim<-range(range(template),range(slope*subSeries) )

plot( template, type="p", pch=19,cex=1.75,lwd=2.5,lty=1, ann=F, axes=F,frame.plot=T,col="red", ylim=yLim,new=T )

title( main = "myDotChart of original template and subSeries vs time" );points( slope*subSeries, type="p", pch=15,cex=1.35,lty=2,lwd=2.5, col="blue", ann=F )

I want to connect the two corresponding points at the same x-coordinate ( x-axes is shared by both plots essentially). I want to connect the template points to the subSeries points at each x-coordinate.

The x-axes is 1:30 in both plot and the points;

Here's an example for the 2 points trying to connect two points for the x-coordinate = 3:

segments(3, template, 3,subSeries, col= "black",lwd=2)Now here's what I get: a black line from the x-axis to the point: c(3, template)In other words the above statement acts the same as: segments(3, template, 3, 0, col= "black",lwd=2);I cannot make segments or lines that connect two points at the same x-coordinate.I also tried this: segments(3.1, template, 2.9,subSeries, col= "black",lwd=2) whichstill drew a line starting at the x-axes, ignoring the subSeries point altogether.How can I generate line segments between two sets of points on the same graph?Sincerely,Lloyd L

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