repfromto {ff} | R Documentation |
repfromto
virtually recylcles object x
and cuts out positions from .. to
repfromto(x, from, to) repfromto(x, from, to) <- value
x |
an object from which to recycle |
from |
first position to return |
to |
last position to return |
value |
value to assign |
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
a vector of length from - to + 1
Jens Oehlschlägel
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