[R] Plotting points from two vectors onto the same graph

[Mulholland, Tom]

?points has this example

plot(-4:4, -4:4, type = "n")# setting up coord. system
points(rnorm(200), rnorm(200), col = "red")
points(rnorm(100)/2, rnorm(100)/2, col = "blue", cex = 1.5)

In general you might want to check out the keyword section of the help, in particular the Graphics section which has an entry called aplot for ways to add to existing plots.

Tom

> -----Original Message-----
> From: K Fernandes [mailto:kafernan at uwaterloo.ca]
> Sent: Friday, 21 January 2005 9:51 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] Plotting points from two vectors onto the same graph
> 
> 
> Hello,
> 
> I have three vectors defined as follows:
> 
> > x<-c(10,20,30,40,50)
> > y1<-c(154,143,147,140,148)
> > y2<-c(178,178,171,188,180)
> 
> I would like to plot y1 vs x and y2 vs x on the same graph.  
> How might I do
> this?  I have looked through a help file on plots but could 
> not find the
> answer to plotting multiple plots on the same graph.
> 
> Thank you for your help,
> K
> 
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