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

 

 


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