Message-ID: <9707EBA615A57747A0668CECD4638A3001680292@mail.agso.gov.au>
Date: 2006-02-08T05:19:01Z
From: Augusto.Sanabria@ga.gov.au
Subject: 15-min mean values
Thanks a lot to Gabor for his help with the solution
of this problem.
The solution using "zoo(aggregate)"
is easy to implement & efficient. I have calculated
the 15min mean values of a 1min wind speed file
containing 2.9 million records x 16 columns
(size 179 MB) in just 144 seconds
(R-2.1.1 running in a GNU/LINUX machine).
Thanks to Bogdan too for his suggested solution using
SQL, I have not tried that one yet.
Augusto