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)c("bytes", "chars", "width"). See ‘Details’.NA be returned for invalid
multibyte strings or "bytes"-encoded strings (rather than
throwing an error)?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.A character string marked with "bytes" encoding (see
Encoding) has a number of bytes, but neither a known
number of characters nor a width, so the latter two types are
NA if allowNA = TRUE, otherwise an error.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.
bytes
chars
widthcat 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.\ifelse{latex}{\out{~}}{ } 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.
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
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