Create integer sequences defined by ‘from’ and ‘to’ vectors

by

Just use mapply:

Start = c(1,10,20)
Finish = c(9,19,30)
mapply(":", Start, Finish)
## [[1]]
## [1] 1 2 3 4 5 6 7 8 9
## 
## [[2]]
##  [1] 10 11 12 13 14 15 16 17 18 19
## 
## [[3]]
##  [1] 20 21 22 23 24 25 26 27 28 29 30
##

You could, of course, also use Vectorize, but that’s just a wrapper for mapply. However, Vectorize cannot be used with primitive functions, so you’ll have to specify seq.default rather than seq, or seq.int.

Example:

Vectorize(seq.default)(Start, Finish)
## [[1]]
## [1] 1 2 3 4 5 6 7 8 9
## 
## [[2]]
##  [1] 10 11 12 13 14 15 16 17 18 19
## 
## [[3]]
##  [1] 20 21 22 23 24 25 26 27 28 29 30
##

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