生成的字符序列

Question

我可以让数字的这样一个顺序：

s = seq(from = 1, to = 10, by = 1) 

如何使字符从A到Z的顺序？这不起作用：

seq(from = 1, to = 10) 

Answer 1

使用LETTERS和letters（大写和小写分别）。

Answer 2

只需使用预定义变量letters和LETTERS即可。

以及物品是否完整，这东西用seq：

R> rawToChar(as.raw(seq(as.numeric(charToRaw('a')), as.numeric(charToRaw('z'))))) 
[1] "abcdefghijklmnopqrstuvwxyz" 
R> 

Answer 3

使用为letters和/或LETTERS代码：

> LETTERS[seq(from = 1, to = 10)] 
[1] "A" "B" "C" "D" "E" "F" "G" "H" "I" "J" 
> letters[seq(from = 1, to = 10)] 
[1] "a" "b" "c" "d" "e" "f" "g" "h" "i" "j" 

Answer 4

R.oo包有一个intToChar功能，使用ASCII值，如果LETTERS和letters不合适。 A是ASCII 65：

> require(R.oo) 
> intToChar(65:79) 
[1] "A" "B" "C" "D" "E" "F" "G" "H" "I" "J" "K" "L" "M" "N" "O" 

，或者你可以使用一个事实，即最低Unicode数字是ASCII，因此intToUtf8在R基本是这样的：

> intToUtf8(65:78,multiple=TRUE) 
[1] "A" "B" "C" "D" "E" "F" "G" "H" "I" "J" "K" "L" "M" "N" 

或rawToChar faff各地：

> rawToChar(as.raw(65:78)) 
[1] "ABCDEFGHIJKLMN"