| 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