length(x)
length(x) <- valuelength currently returns a non-negative
integer of length 1, except for vectors of more than
$2^31 - 1$ elements, when it returns a double.For vectors (including lists) and factors the length is the number of
elements. For an environment it is the number of objects in the
environment, and NULL has length 0. For expressions and
pairlists (including language objects and dotlists) it is the
length of the pairlist chain. All other objects (including functions)
have length one: note that for functions this differs from S.The replacement form removes all the attributes of x except its
names, which are adjusted (and if necessary extended by "").
double (\href{https://CRAN.R-project.org/package=#1}{\pkg{#1}}MatrixMatrix), even with non-integer values
(earlier versions of \href{https://CRAN.R-project.org/package=#1}{\pkg{#1}}setssets). Where a single double value is
returned that can be represented as an integer it is returned as a
length-one integer vector. As from R 3.0.0, lengths can be returned as double in base R.length<- has a
"factor" method. The replacement form can be used to reset the length of a vector. If
a vector is shortened, extra values are discarded and when a vector is
lengthened, it is padded out to its new length with NAs
(nul for raw vectors).
Both are primitive functions.
nchar for counting the number of characters in character
vectors, lengths for getting the length of every element
in a list.
length(diag(4)) # = 16 (4 x 4)
length(options()) # 12 or more
length(y ~ x1 + x2 + x3) # 3
length(expression(x, {y <- x^2; y+2}, x^y)) # 3
## from example(warpbreaks)
require(stats)
fm1 <- lm(breaks ~ wool * tension, data = warpbreaks)
length(fm1$call) # 3, lm() and two arguments.
length(formula(fm1)) # 3, ~ lhs rhs
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