ff: length.hi – R documentation

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length.hi

Hybrid Index, querying

Description

Functions to query some index attributes

Usage

## S3 method for class 'hi'
length(x)
## S3 method for class 'hi'
maxindex(x, ...)
## S3 method for class 'hi'
poslength(x, ...)

Arguments

`x`	an object of class `hi`
`...`	further arguments (not used)

Details

length.hi returns the number of the subsript elements in the index (even if they are negative). By contrast poslength returns the number of selected elements (which for negative indices is maxindex(x) - length(unique(x))). maxindex returns the highest possible index position.

Value

an integer scalar

Note

duplicated negative indices are removed

Author(s)

Jens Oehlschlägel

Examples

length(as.hi(-1, maxindex=12))
  poslength(as.hi(-1, maxindex=12))
  maxindex(as.hi(-1, maxindex=12))
  message("note that")
  length(as.hi(c(-1, -1), maxindex=12))
  length(as.hi(c(1,1), maxindex=12))

ff

Memory-Efficient Storage of Large Data on Disk and Fast Access Functions

v4.0.4

GPL-2 | GPL-3 | file LICENSE

Authors

Daniel Adler [aut], Christian Gläser [aut], Oleg Nenadic [aut], Jens Oehlschlägel [aut, cre], Martijn Schuemie [aut], Walter Zucchini [aut]

Initial release

2020-10-13