两个单词字符串中两个单词的首字母大写

Try:

require(Hmisc)
sapply(name, function(x) {
paste(sapply(strsplit(x, ' '), capitalize), collapse=' ')
})

The base R function to perform capitalization is toupper(x). From the help file for ?toupper there is this function that does what you need:

simpleCap <- function(x) {
s <- strsplit(x, " ")[[1]]
paste(toupper(substring(s, 1,1)), substring(s, 2),
sep="", collapse=" ")
}


name <- c("zip code", "state", "final count")


sapply(name, simpleCap)


zip code         state   final count
"Zip Code"       "State" "Final Count"

Edit This works for any string, regardless of word count:

simpleCap("I like pizza a lot")
[1] "I Like Pizza A Lot"

From the help page for ?toupper:

.simpleCap <- function(x) {
s <- strsplit(x, " ")[[1]]
paste(toupper(substring(s, 1,1)), substring(s, 2),
sep="", collapse=" ")
}




> sapply(name, .simpleCap)


zip code         state   final count
"Zip Code"       "State" "Final Count"

Match a regular expression that starts at the beginning ^ or after a space [[:space:]] and is followed by an alphabetical character [[:alpha:]]. Globally (the g in gsub) replace all such occurrences with the matched beginning or space and the upper-case version of the matched alphabetical character, \\1\\U\\2. This has to be done with perl-style regular expression matching.

gsub("(^|[[:space:]])([[:alpha:]])", "\\1\\U\\2", name, perl=TRUE)
# [1] "Zip Code"    "State"       "Final Count"

In a little more detail for the replacement argument to gsub(), \\1 says 'use the part of x matching the first sub-expression', i.e., the part of x matching (^|[[:spacde:]]). Likewise, \\2 says use the part of x matching the second sub-expression ([[:alpha:]]). The \\U is syntax enabled by using perl=TRUE, and means to make the next character Upper-case. So for "Zip code", \\1 is "Zip", \\2 is "code", \\12 is "Code", and \\13 is "Zip Code".

The ?regexp page is helpful for understanding regular expressions, ?gsub for putting things together.

Use this function from stringi package

stri_trans_totitle(c("zip code", "state", "final count"))
## [1] "Zip Code"      "State"       "Final Count"


stri_trans_totitle("i like pizza very much")
## [1] "I Like Pizza Very Much"

Alternative way with substring and regexpr:

substring(name, 1) <- toupper(substring(name, 1, 1))
pos <- regexpr(" ", name, perl=TRUE) + 1
substring(name, pos) <- toupper(substring(name, pos, pos))

The package BBmisc now contains the function capitalizeStrings.

library("BBmisc")
capitalizeStrings(c("the taIl", "wags The dOg", "That Looks fuNny!")
, all.words = TRUE, lower.back = TRUE)
[1] "The Tail"          "Wags The Dog"      "That Looks Funny!"

Alternative:

library(stringr)
a = c("capitalise this", "and this")
a
[1] "capitalise this" "and this"
str_to_title(a)
[1] "Capitalise This" "And This"

There is a build-in base-R solution for title case as well:

tools::toTitleCase("demonstrating the title case")
## [1] "Demonstrating the Title Case"

or

library(tools)
toTitleCase("demonstrating the title case")
## [1] "Demonstrating the Title Case"

You could also use the snakecase package:

install.packages("snakecase")
library(snakecase)


name <- c("zip code", "state", "final count")
to_title_case(name)
#> [1] "Zip Code"    "State"       "Final Count"


# or
to_upper_camel_case(name, sep_out = " ")
#> [1] "Zip Code"    "State"       "Final Count"

https://github.com/Tazinho/snakecase

This gives capital Letters to all major words

library(lettercase)
xString = str_title_case(xString)

Here is a slight improvement on the accepted answer that avoids having to use sapply(). Also forces non-first characters to lower.

titleCase <- Vectorize(function(x) {
  

# Split input vector value
s <- strsplit(x, " ")[[1]]
  

# Perform title casing and recombine
ret <- paste(toupper(substring(s, 1,1)), tolower(substring(s, 2)),
sep="", collapse=" ")
  

return(ret)
  

}, USE.NAMES = FALSE)




name <- c("zip CODE", "statE", "final couNt")


titleCase(name)


#> "Zip Code"       "State" "Final Count"

Another version using StrCap in DescTools

Text = c("This is my phrase in r", "No, this is not my phrase in r")


DescTools::StrCap(Text) # Default only first character capitalized
[1] "This is my phrase in r"         "No, this is not my phrase in r"


DescTools::StrCap(Text, method = "word") # Capitalize each word
[1] "This Is My Phrase In R"        "No This Is Not My Phrase In R"


> DescTools::StrCap(Text, method = "title") # Capitalize as in titles
[1] "This Is My Phrase in R"         "No, This Is Not My Phrase in R"

✓ one line
✓ one existing function; no new package
✓ works on list/all words
✓ capitalizes the first letter AND lowers the rest of the word :

name <- c("zip CODE", "statE", "final couNt")
gsub("([\\w])([\\w]+)", "\\U\\1\\L\\2", name, perl = TRUE)

[1] "Zip Code"    "State"       "Final Count"

If you plan on using it a lot, I guess you could make a wrapper function with it :

capFirst <- function(x) gsub("([\\w])([\\w]+)", "\\U\\1\\L\\2", x, perl = TRUE)
capFirst(name)