vector {base}R Documentation

Vectors

Description

vector produces a vector of the given length and mode.

as.vector, a generic, attempts to coerce its argument into a vector of mode mode (the default is to coerce to whichever mode is most convenient). The attributes of x are removed.

is.vector returns TRUE if x is a vector (of mode logical, integer, real or character if not specified) and FALSE otherwise.

Usage

vector(mode = "logical", length = 0)
as.vector(x, mode = "any")
is.vector(x, mode = "any")

Arguments

mode A character string giving an atomic mode, or "any".
length A non-negative integer specifying the desired length.
x An object.

Details

Note that factors are not vectors; is.vector returns FALSE and as.vector converts to character mode.

Value

For vector, a vector of the given length and mode. Logical vector elements are initialized to FALSE, numeric vector elements to 0 and character vector elements to "".

See Also

c, is.numeric, is.list, etc.

Examples

df <- data.frame(x=1:3, y=5:7)
## Error:
  as.vector(data.frame(x=1:3, y=5:7), mode="numeric")

###-- All the following are TRUE:
is.list(df)
! is.vector(df)
! is.vector(df, mode="list")

is.vector(list(), mode="list")
is.vector(NULL,   mode="NULL")
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