| nchar {base} | R Documentation |
nchar takes a character vector as an argument and
returns a vector whose elements contain the sizes of
the corresponding elements of x.
nzchar is a fast way to find out if elements of a character
vector are non-empty strings.
nchar(x, type = "chars", allowNA = FALSE) nzchar(x)
x |
character vector, or a vector to be coerced to a character vector. |
type |
character string: partial matching to one of
c("bytes", "chars", "width"). See ‘Details’. |
allowNA |
logical: show NA be returned for invalid
multibyte strings (rather than throwing an error)? |
The ‘size’ of a character string can be measured in one of three ways
bytescharswidthcat will use to
print the string in a monospaced font. The same as chars
if this cannot be calculated.These will often be the same, and almost always will be in single-byte locales. There will be differences between the first two with multibyte character sequences, e.g. in UTF-8 locales.
The internal equivalent of the default method of
as.character is performed on x (so there is no
method dispatch). If you want to operate on non-vector objects
passing them through deparse first will be required.
nzchar is primitive and so will ignore any argument name.
For nchar, an integer vector giving the sizes of each element,
currently always 2 for missing values (for NA).
If allowNA = TRUE and an element is invalid in a multi-byte
character set such as UTF-8, its number of characters and the width
will be NA. Otherwise the number of characters will be
non-negative, so !is.na(nchar(x, "chars", TRUE)) is a test of
validity.
Names, dims and dimnames are copied from the input.
For nzchar, a logical vector of the same length as x,
true if and only if the element has non-zero length.
This does not by default give the number of characters that
will be used to print() the string. Use
encodeString to find the characters used to print the
string.
Where character strings have been marked as UTF-8, the number of
characters and widths will be computed in UTF-8, even though printing
may use escapes such as <U+2642> in a non-UTF-8 locale.
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
strwidth giving width of strings for plotting;
paste, substr, strsplit
x <- c("asfef", "qwerty", "yuiop[", "b", "stuff.blah.yech")
nchar(x)
# 5 6 6 1 15
nchar(deparse(mean))
# 18 17