[R] Memory management

[Charles Raux]

Some naive questions:
1) How to remove a column in a data frame? I expected that rm would
work but this is not the case (e.g. rm(dat$yyy) gives Warning
message: remove: variable dat$yyy was not found). I only found to
assign NULL value (e.g.: dat$yyy<-NULL). Is it the right way?
2) Is the place formerly occupied by dat$yyy automatically gained by
R for other uses?
3) If t1 and t2 are 2 only existing objects in a R session: does
t1<-t2 automatically free the space formerly occupied by t1 ? Do I
get an exact copy of t2, that is the total memory taken is twice that
of t2.
---------------
Charles RAUX,
Laboratoire d'Economie des Transports
CNRS-Université Lumière Lyon 2-ENTPE
email : charles.raux at let.ish-lyon.cnrs.fr
http://www.ish-lyon.cnrs.fr/let

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