repfromto {ff}R Documentation

Virtual recycling

Description

repfromto virtually recylcles object x and cuts out positions from .. to

Usage

repfromto(x, from, to)
repfromto(x, from, to) <- value

Arguments

x an object from which to recycle
from first position to return
to last position to return
value value to assign

Details

repfromto is a generalization of rep, where rep(x, n) == repfromto(x, 1, n). You can see this as an R-side (vector) solution of the mod_iterate macro in arithmetic.c

Value

a vector of length from - to + 1

Author(s)

Jens Oehlschlägel

See Also

rep, ffvecapply

Examples

  cat("a simple example")
  repfromto(0:9, 11, 20)

  cat("and an example how to use it")
  x <- ff(1:1000)
  y <- -(1:3)
  ffvecapply(x[i1:i2] <- repfromto(y, i1, i2), X=x)
  x

[Package ff version 2.0.0 Index]