string 大写的第一个字母
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First letter to upper case
提问by Klaus
Is there a other version to make the first letter of each string capital and also with FALSE for flac perl?
是否有其他版本可以使每个字符串的第一个字母大写，并且对于 flac perl 还使用 FALSE？
name<-"hallo"
gsub("(^[[:alpha:]])", "\U\1", name, perl=TRUE)
回答by alko989
You can try something like:
您可以尝试以下操作：
name<-"hallo"
paste(toupper(substr(name, 1, 1)), substr(name, 2, nchar(name)), sep="")
Or another way is to have a function like:
或者另一种方法是具有如下功能：
firstup <- function(x) {
substr(x, 1, 1) <- toupper(substr(x, 1, 1))
x
}
Examples:
例子：
firstup("abcd")
## [1] Abcd
firstup(c("hello", "world"))
## [1] "Hello" "World"
回答by Hyman Wasey
As pointed out in the comment, it is now possible to do:
stringr::str_to_title("iwejofwe asdFf FFFF")
正如评论中所指出的，现在可以这样做：
stringr::str_to_title("iwejofwe asdFf FFFF")
stringruses stringiunder the hood which takes care of complex internationalization, unicode, etc., you can do:
stri_trans_totitle("kaCk, DSJAIDO, Sasdd.", opts_brkiter = stri_opts_brkiter(type = "sentence"))
stringrstringi在处理复杂国际化、unicode 等的引擎盖下使用，您可以执行以下操作：
stri_trans_totitle("kaCk, DSJAIDO, Sasdd.", opts_brkiter = stri_opts_brkiter(type = "sentence"))
There is a C or C++ library underneath stringi.
下面有一个 C 或 C++ 库stringi。
回答by irJvV
for the lazy typer:
对于懒惰的打字机：
paste0(toupper(substr(name, 1, 1)), substr(name, 2, nchar(name)))
will do too.
也会做。
回答by laviex
Often we want onlythe first letter upper case, rest of the string lower case. In such scenario, we need to convert the whole string to lower case first.
通常我们只需要第一个字母大写，其余的字符串小写。在这种情况下，我们需要先将整个字符串转换为小写。
Inspired by @alko989 answer, the function will be:
受到@alko989 回答的启发，该功能将是：
firstup <- function(x) {
x <- tolower(x)
substr(x, 1, 1) <- toupper(substr(x, 1, 1))
x
}
Examples:
例子：
firstup("ABCD")
## [1] Abcd
Another option is to use str_to_titlein stringrpackage
另一种选择是str_to_title在stringr包中使用
dog <- "The quick brown dog"
str_to_title(dog)
## [1] "The Quick Brown Dog"
