| codes-deprecated {base} | R Documentation |
This (generic) function returns a numeric coding of a factor. It can also be used to assign to a factor using the coded form.
It is now Deprecated.
codes(x, ...) codes(x, ...) <- value
x |
an object from which to extract or set the codes. |
... |
further arguments passed to or from other methods. |
value |
replacement value. |
For an ordered factor, it returns the internal coding (1 for the
lowest group, 2 for the second lowest, etc.).
For an unordered factor, an alphabetical ordering of the levels is
assumed, i.e., the level that is coded 1 is the one whose name is
sorted first according to the prevailing collating sequence.
Warning: the sort order may well depend on the locale, and
should not be assumed to be ASCII.
Normally codes is not the appropriate function to use with an
unordered factor. Use unclass or
as.numeric to extract the codes used in the internal
representation of the factor, as these do not assume that the codes
are sorted.
The behaviour for unordered factors is dubious, but compatible with S
version 3. To get the internal coding of a factor, use
as.integer. Note in particular that the codes may not
be the same in different language locales because of collating
differences.
## Not run: codes(rep(factor(c(20,10)),3)) x <- gl(3,5) codes(x)[3] <- 2 x data(esoph) ( ag <- esoph$alcgp[12:1] ) codes(ag) codes(factor(1:10)) # BEWARE! ## End(Not run)