Small cache access methods
These methods are packaged here for methods in packages bit64 and ff.
## S3 method for class 'integer64' is.sorted(x, ...) ## S3 method for class 'integer64' na.count(x, ...) ## S3 method for class 'integer64' nvalid(x, ...) ## S3 method for class 'integer64' nunique(x, ...) ## S3 method for class 'integer64' nties(x, ...)
x |
some object |
... |
ignored |
All these functions benefit from a sortcache, ordercache or sortordercache.
na.count, nvalid and nunique also benefit from a hashcache.
is.sorted checks for sortedness of x (NAs sorted first) na.count returns the number of NAs nvalid returns the number of valid data points, usually length minus na.count. nunique returns the number of unique values nties returns the number of tied values.
is.sorted returns a logical scalar, the other methods return an integer scalar.
If a cache exists but the desired value is not cached,
then these functions will store their result in the cache.
We do not consider this a relevant side-effect,
since these small cache results do not have a relevant memory footprint.
Jens Oehlschlägel <Jens.Oehlschlaegel@truecluster.com>
cache for caching functions and sortordercache for functions creating big caches
x <- as.integer64(sample(c(rep(NA, 9), 1:9), 32, TRUE)) length(x) na.count(x) nvalid(x) nunique(x) nties(x) table.integer64(x) x
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