Question

I’m trying to draw a legend in R that has three different point styles, all with two-digit pch values. I’ve escpated each value with a backslash, but R isn’t reading that correctly and I can’t figure out the correct syntax. Below is a toy example, along with the output graph. This syntax works fine with single-digit pch values. What’s the secret for properly escaping two-digit pch values?

y1 = 1:10
y2 = rep(5,10)
y3 = seq(3.5,4.4,.1)
x = 1:10
plot(x,y1, pch=19, lty=1, type="b", ylab="")
lines(x,y2, pch=15, lty=2, type="b", col="red")
lines(x,y3, pch=17, lty=3, type="b", col="blue")
legend(1,10, 
   c("Y1","Y2","Y3"), 
   lty=c(1,2,3), 
   pch=c("\19\15\17"), 
   col=c("black","red","blue"))

Answer 1

As Joran said in his comment, just do pch=c(19,15,17).