I need to create the following sequence:
> A
1, 2, 3, 11, 12, 13, 21, 22, 23, 31, 32, 33
> B
-1, 2, -3, 4, -5, 6, -7, 8, -9, 10
I've tried to use seq() function like this:
seq(1:3, 31:33, by = 10)
But it only allows to input 1 number in "from" and "to"
Maybe, someone knows how to use this or other functions to create the given sequence. Thank you in advance.
You can use :
A <- c(sapply(seq(0, 30, 10), `+`, 1:3))
A
#[1] 1 2 3 11 12 13 21 22 23 31 32 33
B <- 1:10 * c(-1, 1)
B
#[1] -1 2 -3 4 -5 6 -7 8 -9 10
Here's one way to get to A:
A <- rep(1:3, 3) + rep(c(0, 10, 20), each=3)
or to generalize to n
A <- rep(1:n, n) + rep(seq(0, by=10, length.out=n), each=n)
For B, I can't find anything truly elegant:
B <- 1:10 * (-1)^(1:10 %% 2)
That's the best I got
