Description Usage Arguments Details Value Note Author(s) See Also Examples
Converts uppercase to lowercase letters for the first n characters of a character string.
1 | nfirst2lower(x, n = 1, first = TRUE, second = FALSE)
|
x |
a character string. |
n |
an integer. Number of characters that we want to convert. |
first |
logical. If |
second |
logical. If |
It is a function to convert some uppercase letters into lowercase for which words with uppercase second letter. If tolower
in base R is used, it will be sometimes created a problem for proper nouns. Because, as we know, a name or proper noun starts with capital letter and we do not want to convert them into lowercase. But sometimes there are some words which are not a name or proper noun and displayed in capital letters. These words are the target of this function.
If we have a text of several sentences and we want to convert the first n letters of every sentence to lowercase, separately. We have to split text to sentences, furthermore we should consider first=TRUE
and apply the function for each sentence (see the examples below).
If we have a list, it works fine.
A character string.
Because of all sentences begin with uppercase letters, first=TRUE
is considered as a default. But, if the second character of a word be capital, it is usually
concluded that all its characters are capital. In this case, you can consider second=TRUE
. Of course, there are some exceptations in these cases that they can be ignored (see the examples below).
In general, if there are not a lot of proper nouns in your text string, we suggest you to use tolower
in base R. As an ability of this function, lower
is considered as a third argument.
Neda Daneshgar and Majid Sarmad.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | # x is a list
x=list('W-A for an English-Persian Parallel Corpus (Mizan).','ALIGNMENT is a link between words.')
nfirst2lower(x, n=8) ## nfirst2lower(x, n=8) is not a list
y='MT is the automatic translation. SMT is one of the methods of MT.'
nfirst2lower(y) # only run for the first sentence
u1=unlist(strsplit(y, ". ", fixed = TRUE))
sapply(1:length(u1),function(x)nfirst2lower(u1[x])) ## run for all sentences
h = 'It is a METHOD for this function.'
nfirst2lower (h, second = TRUE) #only run for the first word
h1 = strsplit(h, ' ')[[1]]
nfirst2lower(h1, second = TRUE) # run for all words
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