Odd graphing issue

Question

Consider the following plot:

 par(xaxs='i',yaxs='i') q = c(1000000,1051548,1073218,1087563,1097765,1109949,1113169,1124302,1134923,1137264,1132633,1235922,1351977,1474207,1602776,1746385,1905937,2077873,2276724,2487994,2718546,2939262,3209654,3543057,3858329,4243562,4301907,4332465,4392545,4412729,4429758) x <- seq(0,30, by = 1) plot(x, q, type = "l", bty = "L", ylim = c(0, max(q2)), xlim = c(0,30), xaxt = 'n', yaxt = 'n', xlab = "", ylab = "") points(20, q[20])

enter image description here

I am plotting the line q and the point with coordinates (20,q[20]). The weird thing is that the point doesn't get plotted on the line, while it actually belongs to the line..

I am not sure what I am doing wrong here. I have been trying to solve this problem for over an hour!!

Thanks!

Do points(20, q[21]). Your x vector sequence is from 0 to 30, but R indexes starting from 1. 20 in your x is the 21st element. — Thomas
– Thomas, Commented Oct 23, 2013 at 20:09
I think I have been in front of a screen for too long today. Very obvious mistakes. Thanks for helping out! — Mayou
– Mayou, Commented Oct 23, 2013 at 20:10

Christian · Accepted Answer · 2013-10-23 23:36:49Z

1

R starts it's index with 1. That means you have to run points(20, q[21]) do get the point on the line.

answered Oct 23, 2013 at 23:36

Christian

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