Created
October 4, 2017 05:23
-
-
Save neilfws/b5570f577e943bd03cdc2c171937e11f to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
# taken from the fifer package | |
# https://github.com/dustinfife/fifer | |
excelCols <- function (n) | |
{ | |
vec1 = LETTERS | |
if (n <= 26) { | |
res = vec1[seq_len(n)] | |
} | |
else if (n > 26 & n <= 702) { | |
res = c(vec1, apply(expand.grid(vec1, vec1)[, 2:1], | |
1, paste, collapse = ""))[1:n] | |
} | |
else if (n > 702 & n <= 18278) { | |
res = c(vec1, apply(expand.grid(vec1, vec1)[, 2:1], | |
1, paste, collapse = ""), apply(expand.grid(vec1, | |
vec1, vec1)[, 3:1], 1, paste, collapse = ""))[1:n] | |
} | |
else { | |
res = NA | |
} | |
res | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment