repnam: Replicate with names

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

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

See Also

rep, vector, repfromto

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 documentation built on Sept. 30, 2024, 9:38 a.m.