index | R Documentation |

Generic functions for extracting the index of an object and replacing it.

index(x, ...) index(x) <- value

`x` |
an object. |

`...` |
further arguments passed to methods. |

`value` |
an ordered vector of the same length
as the |

`index`

is a generic function for extracting the index
of objects, currently it has a default method and a method
for `zoo`

objects which is the same as the
`time`

method for `zoo`

objects.
Another pair of generic functions provides replacing
the `index`

or `time`

attribute.
Methods are available for `"zoo"`

objects only, see examples below.

The start and end of the index/time can be queried by using
the methods of `start`

and `end`

.

`time`

, `zoo`

suppressWarnings(RNGversion("3.5.0")) set.seed(1) x.date <- as.Date(paste(2003, 2, c(1, 3, 7, 9, 14), sep = "-")) x <- zoo(rnorm(5), x.date) ## query index/time of a zoo object index(x) time(x) ## change class of index from Date to POSIXct ## relative to current time zone x index(x) <- as.POSIXct(format(time(x)),tz="") x ## replace index/time of a zoo object index(x) <- 1:5 x time(x) <- 6:10 x ## query start and end of a zoo object start(x) end(x) ## query index of a usual matrix xm <- matrix(rnorm(10), ncol = 2) index(xm)

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