Hi
I have a time series of measurements: every 10 min. a value was logged.
The data look like:
20100914 08:01 3.74
20100914 08:11 3.74
20100914 08:21 3.71
20100914 08:31 4.39
20100914 08:41 3.74
This data spans several months.
I would like to group the data per day. In Matlab it is fairly easy to
obtain a cell array, of which the first column contains the date of each
day, and the second column contains a vector, that in its turn contains
all values for the corresponding day.
That looks like
14-9-2010 [3.74 3.74 3.71 4.39 3.74...]
15-9-2010 [...]
and so on.
Is it possible to create a similar data structure in in R? I was
thinking of a data frame, similar to the Matlab's cell array, but it
doesn't look like data frames can contain vectors. Something like a two
dimensional list would do the trick, I believe, but does that exist?
Thanks
Kind regards
Matthijs Daelman