[R] Plotting a graph of many lines between groups of points.. .

[Liaw, Andy]

> From: Andrew Johnson [mailto:johnson.2060 at osu.edu] 
> 
> I have a data file read into a data frame.
> 
> For example,
> 
> 	V1	V2	V3	V4
> 1	1	1	3	4
> 2	2	3	5	10
> .	.	.	.	.
> .	.	.	.	.
> n          V1[n]     V2[n]     V3[n]     V4[n]
> 
> to n=many thousand
> 
> I want to plot a graph with many line segments, where 
> v1[i]=x1, v2[i]=y1, 
> v3[i]=x2, v4[i]=y2 for i=1,n.
> 
> This seems relatively simple in theory but I've spent quite a 
> bit of time 
> trying to make it happen with plot(type=), points(x,y), or 
> lines(x,y) to no 
> avail.
> 
> Do I need to turn these into vectors before plotting them?

See if matplot(mydata[,c(1,3)], mydata[,c(2,4)]) does what you want.  If so,
check the help page for matplot for other options.

HTH,
Andy


 
> Any help would be greatly appreciated.
> 
> Thanks,
> Andrew
> 
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