ff: repnam – R documentation

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repnam

Replicate with names

Description

Function repnam replicates its argument to the desired length, either by simply replicating or - if it has names - by replicating the default and matching the argument by its names.

Usage

repnam(argument, names = NULL, len=length(names), default = list(NULL))

Arguments

`argument`	a named or non-named vector or list to be replicated
`names`	NULL or a charcter vector of names to which the argument names are matched
`len`	the desired length (required if names is not given)
`default`	the desired default which is replicated in case names are used (the default `list(NULL)` is suitable for a list argument)

Value

an object like argument or default having length len

Note

This is for internal use, e.g. to handle argument colClasses in read.table.ffdf

Author(s)

Jens Oehlschlägel

Examples

message("a list example")
 repnam(list(y=c(1,2), z=3), letters)
 repnam(list(c(1,2), 3), letters)

 message("a vector example")
 repnam(c(y=1, z=3), letters, default=NA)
 repnam(c(1, 3), letters, default=NA)

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