Message-ID: <53409224-6597-42C3-AAEB-752C2CB2C39E@comcast.net>
Date: 2013-12-20T17:45:28Z
From: David Winsemius
Subject: by class...
In-Reply-To: <C1F4E0C5-C806-43D4-97DA-84A1144D9725@gmail.com>
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