unique.integer64 | R Documentation |
unique
returns a vector like x
but with duplicate elements/rows removed.
## S3 method for class 'integer64'
unique(x, incomparables = FALSE, order = c("original","values","any")
, nunique = NULL, method = NULL, ...)
x |
a vector or a data frame or an array or |
incomparables |
ignored |
order |
The order in which unique values will be returned, see details |
nunique |
NULL or the number of unique values (including NA). Providing |
method |
NULL for automatic method selection or a suitable low-level method, see details |
... |
ignored |
This function automatically chooses from several low-level functions considering the size of x
and the availability of a cache.
Suitable methods are hashmapuni
(simultaneously creating and using a hashmap)
, hashuni
(first creating a hashmap then using it)
, sortuni
(fast sorting for sorted order only)
, sortorderuni
(fast ordering for original order only)
and orderuni
(memory saving ordering).
The default order="original"
returns unique values in the order of the first appearance in x
like in unique
, this costs extra processing.
order="values"
returns unique values in sorted order like in table
, this costs extra processing with the hash methods but comes for free.
order="any"
returns unique values in undefined order, possibly faster. For hash methods this will be a quasi random order, for sort methods this will be sorted order.
For a vector, an object of the same type of x
, but with only
one copy of each duplicated element. No attributes are copied (so
the result has no names).
Jens Oehlschlägel <Jens.Oehlschlaegel@truecluster.com>
unique
for the generic, unipos
which gives the indices of the unique
elements and table.integer64
which gives frequencies of the unique elements.
x <- as.integer64(sample(c(rep(NA, 9), 1:9), 32, TRUE))
unique(x)
unique(x, order="values")
stopifnot(identical(unique(x), x[!duplicated(x)]))
stopifnot(identical(unique(x), as.integer64(unique(as.integer(x)))))
stopifnot(identical(unique(x, order="values")
, as.integer64(sort(unique(as.integer(x)), na.last=FALSE))))
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