vector {base} | R Documentation |

`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).

`is.vector`

returns `TRUE`

if `x`

is a vector (of mode
logical, integer, real, complex, character, raw or list if not
specified) or expression and `FALSE`

otherwise.

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

`mode` |
A character string giving an atomic mode or `"list"` ,
or (not for `vector` ) `"any"` . |

`length` |
A non-negative integer specifying the desired length. |

`x` |
An object. |

The atomic modes are `"logical"`

, `"integer"`

, `"numeric"`

,
`"complex"`

, `"character"`

and `"raw"`

.

`is.vector`

returns `FALSE`

if `x`

has any attributes
except names. (This is incompatible with S.) On the other hand,
`as.vector`

removes *all* attributes including names for
results of atomic mode.

Note that factors are *not* vectors; `is.vector`

returns
`FALSE`

and `as.vector`

converts to a character vector for
`mode = "any"`

.

For `vector`

, a vector of the given length and mode. Logical
vector elements are initialized to `FALSE`

, numeric vector
elements to `0`

, character vector elements to `""`

, raw
vector elements to `nul`

bytes and list elements to `NULL`

.

All attributes are removed from the answer if it is of an atomic mode.

`as.vector`

and `is.vector`

are quite distinct from the
meaning of the formal class `"vector"`

in the **methods**
package, and hence `as(x, "vector")`

and
`is(x, "vector")`

.

`mode`

s of `"symbol"`

, `"pairlist"`

and
`"expression"`

are allowed but have long been undocumented.

Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
*The New S Language*.
Wadsworth & Brooks/Cole.

`c`

, `is.numeric`

, `is.list`

, etc.

df <- data.frame(x=1:3, y=5:7) ## Not run: ## Error: as.vector(data.frame(x=1:3, y=5:7), mode="numeric") ## End(Not run) x <- c(a = 1, b = 2) is.vector(x) as.vector(x) all.equal(x, as.vector(x)) ## FALSE ###-- 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")

[Package *base* version 2.5.0 Index]