[R] having more than one plot in one figure

[kayj]

Hi All,

I have been trying to plot multiple line plots with different colors on one
figure. in my example below I was able to plot cat vs num1 as a dot plot
connected with lines but was not able to do that for cat vs num2 and I do
not know how to add the third plot cat vs num3. below is my code


df <- data.frame(cat=1:10, num1=rnorm(10), num2=rnorm(10), num3=rnorm(10))
plot(df$num1, type="b", col="red", xlab="categories", ylab="random numbers")
points(df$num1, type="p", pch=21, col="red",bg="red")    #plot "num1" 
points(df$num2, type="p", pch=21, col="green")   #plot "num2" 
legend(x="topright", legend=c("num1", "num2"), pch=c(16,16),
col=c("red","green"))    #add a legend 


how to make the second plot of type="b" and how to add a  third plot cat vs
num3?

I appreciate your help


 
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