[R] Does R have an equivalent for Matlab's cell array?

[Rui Barradas]

Hello,

Something like this?


dat <- read.table(text="
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
")
dat

split(dat$V3, dat$V1)


This gives you a list where each element is a (1-dimensional) vector, 
and each of those vectors can have any length, not necessarily the same.

Hope this helps,

Rui Barradas
Em 22-12-2012 10:58, Matthijs Daelman escreveu:
> 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
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide 
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.