R: Length Of A Vector Or List

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length {base}R Documentation

Length of a Vector or List

Description

Get or set the length of vectors (including lists).

Usage

length(x) length(x) <- n

Arguments

x a vector or list.
n an integer.

Details

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.

Value

If x is (or can be coerced to) a vector or list, length returns the length of x. Otherwise, length returns NA.

Examples

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 [Package Contents]

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