by class...
On Dec 20, 2013, at 9:45 AM, David Winsemius wrote:
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:
Or maybe my memories are false. ?by "This is always a list if simplify is false, otherwise a list or array (see tapply)." So maybe you need simplify=FALSE
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
______________________________________________ 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.
David Winsemius Alameda, CA, USA