Create a sequence between two letters

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I want to create a sequence between two letters let's say "b" and "f". So the output is

"b" "c" "d" "e" "f"

For numbers, we can do

2:6 #which gives output as 
[1] 2 3 4 5 6

Is there an easy way to do this with letters as well?

I have gone through Generate a sequence of characters from 'A'-'Z' but this produces all the letters and not sequence between specific letters.

My current solution is,

indx <- which(letters %in% c("b", "f")); 
letters[indx[1] : indx[2]]

#[1] "b" "c" "d" "e" "f"

This works but I am curious if there is an easy way to do this or a function in any of the package that I have missed?

Note: I do not want letters[2:6] as I do not know 2 and 6 beforehand. It could be between any two letters.

This would be another base R option:

letters[(letters >= "b") & (letters <= "f")]
# [1] "b" "c" "d" "e" "f"

Random Letter Sequence Generator, Random Letter Sequence Generator. Number of random letter sequences to generate: Length of each random letter sequence: Letters to choose from: I want to create a sequence between two letters let's say "b" and "f".So the output is "b" "c" "d" "e" "f" For numbers, we can do . 2:6 #which gives output as

You can create your own function:

`%:%` <- function(l, r) {
    intToUtf8(seq(utf8ToInt(l), utf8ToInt(r)), multiple = TRUE)
}

Usage:

"b" %:% "f"
# [1] "b" "c" "d" "e" "f"

"f" %:% "b"
# [1] "f" "e" "d" "c" "b"

"A" %:% "D"
# [1] "A" "B" "C" "D"

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Another option with match, seq and do.call:

letters[do.call(seq, as.list(match(c("b","f"), letters)))]

which gives:

[1] "b" "c" "d" "e" "f"

Making a function of this such that it works with both lower-case and upper-case letters:

char_seq <- function(lets) {
  switch(all(grepl("[[:upper:]]", lets)) + 1L,
         letters[do.call(seq, as.list(match(lets, letters)))],
         LETTERS[do.call(seq, as.list(match(lets, LETTERS)))])
}

the output of this:

> char_seq(c("b","f"))
[1] "b" "c" "d" "e" "f"

> char_seq(c("B","F"))
[1] "B" "C" "D" "E" "F"

This function can be extended with checks on the correctness of the input:

char_seq <- function(lets) {
  g <- grepl("[[:upper:]]", lets)
  if(length(g) != 2) stop("Input is not of length 2")
  if(sum(g) == 1) stop("Input does not have all lower-case or all upper-case letters")
  switch(all(g) + 1L,
         letters[do.call(seq, as.list(match(lets, letters)))],
         LETTERS[do.call(seq, as.list(match(lets, LETTERS)))])
}

resulting in proper error-messages when the input is not correct:

> char_seq(c("B"))
Error in char_seq(c("B")) : Input is not of length 2

> char_seq(c("b","F"))
Error in char_seq(c("b", "F")) : 
  Input does not have all lower-case or all upper-case letters

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Playing with UTF, something like:

intToUtf8(utf8ToInt("b"):utf8ToInt("f"), multiple = TRUE)
# [1] "b" "c" "d" "e" "f"

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Why not?

letters[which(letters == 'b') : which(letters == 'f')]

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Comments
  • What defines your set of "letters"? Do you want the 26 lower-case letters of the Latin alphabet, or do you want the set of letters in the users current locale? Which could be the french, greek, russian, arabic or other alphabet?
  • @Spacedman yes, currently looking only for 26 letters from Latin alphabet.
  • "I do not want letters[2:6] as I do not know 2 and 6 beforehand." So I take it the reason you don't want to do letters[begin:end] is that you want to generate it based on the limits being given as letters rather than numbers?
  • @Acccumulation correct. I have input as letters and not numbers.
  • Ow, nice, didn't know about "multiple = TRUE" option.
  • @zx8754 Yes, this parameter makes intToUtf8 a very handy function.
  • Definitely better than my use of raw.
  • "it does introduce a couple of potentially useful functions" Can you develop?
  • I often find the process of locating conversion functions like charToRaw and rawToChar difficult. Also in the list of functions I have trouble remembering are: intToUtf8 and chartr, sfsmisc::AsciiToInt, stringi::stri_enc_isascii, stringi::stri_enc_toascii. The last few I located by using ??ascii. I think there are a few other utility functions that I sometimes can locate, but not at this moment cannot. I had a lsit in my .Rprofile file on my "regular" computer but I'm now converting from Mac to Linux and don't have it running.
  • I see your point, having myself difficulties to remember functions that I've used months ago. Thanks!
  • Using eval and parse here is blatant abuse, sorry. You can implement the same logic without (e.g. with do.call), although the logic itself is also needlessly convoluted.