On Apr 20, 2010, at 10:34 AM, kayj wrote:
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$num2, type="p", pch=21, col="green") #plot "num2"
legend(x="topright", legend=c("num1", "num2"), pch=c(16,16),
col=c("red","green")) #add a legend
Add the x values since points does not have exactly the same default
behavior when given just one vector for plotting:
df <- data.frame(cat=1:10, num1=rnorm(10), num2=rnorm(10),
num3=rnorm(10))
plot(df$num1, type="b", col="red", xlab="categories", ylab="random
numbers")
points(1:10, df$num2, type="b", pch=21, col="red",bg="red") #plot
"num1"
points(1:10, df$num3, type="b", pch=21, col="green") #plot "num2"
legend(x="topright", legend=c("num1", "num2"), pch=c(16,16),
col=c("red","green")) #add a legend
If you want to have all of the random point visible than use range(c(df
$num1, df$num2, df$num3) as your argument to ylim.
how to make the second plot of type="b" and how to add a third plot
cat vs
num3?
I don't understand why you did not look at the help page for points
and realize that type="b" would work.
I appreciate your help
David Winsemius, MD
West Hartford, CT
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