I have a for loop that generate each time 2 vectors of the same length (length can vary for each iteration) such as:
>aa
[1] 3 5
>bb
[1] 4 8
I want to create a sequence using each element of these vectors to obtain that:
>zz
[1] 3 4 5 6 7 8
Is there a function in R to create that?
We can use Mapto get the sequence of corresponding elements of 'aa' , 'bb'. The output is a list, so we unlist to get a vector.
unlist(Map(`:`, aa, bb))
#[1] 3 4 5 6 7 8
aa <- c(3,5)
bb <- c(4, 8)
One can obtain a sequence by using the colon operator : that separates the beginning of a sequence from its end. We can define such sequences for each vector, aa and bb, and concatenate the results with c() into a single series of numbers.
To avoid double entries in overlapping ranges we can use the unique() function:
zz <- unique(c(aa[1]:aa[length(aa)],bb[1]:bb[length(bb)]))
#> zz
#[1] 3 4 5 6 7 8
with
aa <- c(3,5)
bb <- c(4,8)
Depending on your desired output, here are a few more alternatives:
> do.call("seq",as.list(range(aa,bb)))
[1] 3 4 5 6 7 8
> Reduce(seq,range(aa,bb)) #all credit due to @BrodieG
[1] 3 4 5 6 7 8
> min(aa,bb):max(aa,bb)
[1] 3 4 5 6 7 8
