for loop and if statement in R

Question

I am running the below R code

n = 2
for(i in 1:n){
    if(i+1 <= n){
        for(j in i+1:n){
            print(j)
        }
    }
}

I expect the outcome to be

[1] 2

but in fact I am getting

[1] 2
[1] 3

I am not sure where this 3 comes from. I ran the counterpart python/matlab codes, and I am getting the expected output.

try: (for j in (i+1):n)

Bill O'Brien
– Bill O'Brien

2022-04-07 15:00:30 +00:00
Commented Apr 7, 2022 at 15:00 — Bill O'Brien
– Bill O'Brien, Commented Apr 7, 2022 at 15:00
Chapter 8.1.3 of The R Inferno

Bill O'Brien
– Bill O'Brien

2022-04-07 15:01:50 +00:00
Commented Apr 7, 2022 at 15:01 — Bill O'Brien
– Bill O'Brien, Commented Apr 7, 2022 at 15:01

Wimpel · Accepted Answer · 2022-04-07 15:00:32Z

4

try for(j in (i+1):n){
you want j to go from 2:2, but right now, you let j go from 1 + the numeric vector 1:2.
R differs with python/matlab in how it handles vectors (as you can see below)

try in your console and see how it works

1 + 1:2

and

(1 + 1):2

answered Apr 7, 2022 at 15:00

Wimpel

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