## 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"
```

Essentials of Planning, Selecting, and Tailoring Interventions for , When letter-sound knowledge becomes automatic, the sight of a letter activates the associated sound instantly.12 As skills develop, a sequence of two or more  How to add letters to numbers that appear in sequence in Excel how to add letters in excel, how to add alphabets in excel, How to add characters in Excel.

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
```

Letters from the Pillar Apostles: The Formation of the Catholic , if there is a catchword connection between 2 Peter and 1 John it is not as clear. Though it is Both of these forces would create the sequence James—1 and 2  The Excel SEQUENCE function generates a list of sequential numbers in an array. The array can be one dimensional, or two-dimensional, controlled by rows and columns arguments. Start and step (increment) values are also supplied as arguments. In the example shown, the formula in B4 is: =

Playing with UTF, something like:

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

Meggs' History of Graphic Design, 2–16. Etruscan Bucchero vase, seventh or sixth century bce. A prototype of an with the precision of the stonemason's craft to create letterforms of majestic proportion and sound of V. The W began as a ligature, which is a joining of two letters. A Roman inscription became a sequence of linear geometric forms adapted  Generate regular sequences. Usage. from:toseq(from, to)seq(from, to, by=)seq(from, to, length=)seq(along) Details. The operator :and the first seq(.)form generate thesequence from, from+1, , to. seqis a generic function. The second form generates from, from+by, , to. The third generates a sequence of lengthequally spaced valuesfrom fromto to.

Why not?

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

Human Cognitive Neuropsychology (Classic Edition), what sequence of pen movements will serve to create those letters on the page​. letters, incomplete letters, and forms which looked like fusions of two letters. A sequence is a user-defined schema bound object that generates a sequence of numeric values according to the specification with which the sequence was created. The sequence of numeric values is generated in an ascending or descending order at a defined interval and can be configured to restart (cycle) when exhausted.

English Patents of Inventions, Specifications: 1860, 2046, The sequence of contacts then required is as follows:—The connections are When a pause is required between two letters, words, or sentences, the contact No. We use an improved key for the purpose of making the contacts described,​  CREATE SEQUENCE . Purpose. Use the CREATE SEQUENCE statement to create a sequence, which is a database object from which multiple users may generate unique integers. You can use sequences to automatically generate primary key values. When a sequence number is generated, the sequence is incremented, independent of the transaction committing or rolling back.

Transactions of the Wisconsin Academy of Sciences, Arts, and Letters, draw it into the sequence of exposition, a single point of attachment is elected; In other words I shall, while speaking, think my thought in the shape in which I Instead of making each of two common factors simultaneous, instead that is of​  Sometimes when we know the length of a finite sequence, it is easy to write a simple for-loop to populate the sequence. Consider the sequence consisting of the first n values of the Fibonacci Sequence. The nth value in the Fibonacci sequence is given by the sum of the two previous values in the sequence, i.e. F[n] = F[n - 1] + F[n - 2].

Webster's Academic Dictionary: A Dictionary of the English Language, To make a bid ; to state what one unquestionably right 2 . The sequence . [ Jocosej making bids ; an offer of a price . li Bi - jou ' ( be ( L . bis + littera letter . ) 1 . Create sequential letters (A, B, C) in sequential cells I know how to create sequential NUMBERS - by typing in the first few, highlighting all 3 and then dragging the "X" symbol. However when I try this for LETTERS (A in first box, B in 2nd, C in 3rd) it merely duplicates A, B C.

• "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?
• 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`.
• 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.
• 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.