How to order a character vector in ascend form in R

Question

Hi everybody I am trying to solve a problem in R. I want to read a lot of files allocated in multiples sub folders in a main folder. Then I used list.files() t

Answer 1

If this is the exact data that you have, you can sort it the way you want like this:

> b[order(as.integer(substr(b,2,3)))]
 [1] "A1"  "A2"  "A3"  "A4"  "A5"  "A6"  "A7"  "A8"  "A9"  "A10" "A11" "A12"
[13] "A13" "A14" "A15"

If the actual data is more complicated, you might have to do a little more string manipulation, but this is the general idea.