ffbase (version 0.6-2)

addfforder: Add the order of a ff vector of the ff vector x

Description

Add a ff vector that contains the order of the ff vector x as an attribute. The order can be retrieved using ffordered. Note that you have to assign the result to the original vector x.

Usage

addfforder(x, addsorted = FALSE, ...)

  ffordered(x)

  ffsorted(x)

Arguments

x

ff vector to be indexed

addsorted

should the sorted values also be stored in ffsorted?

...

parameters that will be passed on to fforder.

Value

• The updated vector x

Examples

x <- ff(rnorm(10))

# adds an index to x (note the assignment)
x <- addfforder(x)

# retrieve ffindex
o <- ffordered(x)

o
# use it to sort the original vector
x[o]