I don't think your code is doing what you think it is doing. Try
something like:
with(mtcars, plot(wt, mpg, xlab= "Weight(lbs/1000)", ylab="Miles per
Gallon",
col= c('','','','blue','','red','','purple')[cyl],
pch= c(0,0,0,3,0,17,0,19)[cyl]))
legend(4,30,c("4 cylinder","6 cylinder","8 cylinder"),pch=c(3,17,19),
cex=1.2, col=c("blue", "red", "purple4"))
--
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
[EMAIL PROTECTED]
(801) 408-8111
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Letticia Ramlal
> Sent: Monday, October 01, 2007 12:34 PM
> To: [EMAIL PROTECTED]
> Subject: [R] how to plot a graph with different pch
>
> I am trying to plot a graph but the points on the graph
> should be different symbols and colors. It should represent
> what is in the legend.
> I tried using the points command but this does not work. Is
> there another command in R that would allow me to use
> different symbols and colors for the points?
>
> Thank you kindly.
>
>
>
>
>
> data(mtcars)
>
> plot(mtcars$wt,mtcars$mpg,xlab= "Weight(lbs/1000)", ylab="Miles per
> Gallon")
>
> mtcars$wt.cyl<-mtcars$wt[mtcars$cyl]
>
> mtcars$mpg.cyl<-mtcars$mpg[mtcars$cyl]
>
> points(mtcars$wt.cyl, mtcars$mpg.cyl, pch = 17, col = "red")
>
> title("Motor Trend Data")
>
> text(2,10,"LTR",cex=1.2,adj=0,col=3)
>
> legend(4,30,c("4 cylinder","6 cylinder","8
> cylinder"),pch=c(3,17,19), cex=1.2, col=c("blue", "red", "purple4"))
>
>
>
>
>
> LTR
>
>
>
>
>
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
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> and provide commented, minimal, self-contained, reproducible code.
>
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