[R] by class...

[David Winsemius]

On Dec 20, 2013, at 9:38 AM, Onur Uncu wrote:

> I used the by() function on a data.frame to get sums of the data grouped by 2 factors. The function worked however the output is in a class called 'by'. Not familiar with this class. How can I turn the output into a nice table where columns represent values of factor1, row represent values of factor2 and the entries in the table are the sums that were calculated using the by function?
> 
> I did some web search which suggested using do.call(rbind, datframe_object) but this command gave the following error:
> "Second argument must be a list"...

The output of by() is always a list, so I would have expected:

do.call(rbind, by.object) to have retruned a different error message that what you suggest.


> 
> 
> Thank you.
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David Winsemius
Alameda, CA, USA