[R] working with zoo time index ??

From: skan <juanpide_at_gmail.com>
Date: Tue, 15 Jun 2010 05:27:42 -0700 (PDT)


Where could I find examples on how to work with the time index in a timeseries or zoo series?

Let say I've got this series


1990-01-01 10:00:00   0.900
1990-01-01 10:01:00   0.910
1990-01-01 10:03:00   0.905
1990-01-01 10:04:00   0.905
1990-01-01 10:05:00   0.890


2000-12-31 20:00:00 0.992

How do I make simple calculations such as ... ? Calculate the mean of the first data every day. (mapply, for loop, tapply ?) Transform data to a table, with dates in one axis and times in the other.


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