How to implement a "select distinct x, count(distinct y) ... group by x" for a data frame
Yes. ?sqldf ?split ?lapply But unless you provide commented, minimal, self-contained, reproducible code, it is hard to say how to proceed to a solution. On Sat, Jan 23, 2010 at 5:46 PM, Dimitri Shvorob
<dimitri.shvorob at gmail.com> wrote:
... Being an R newbie, I can only think of extracting distinct x values with unique, looping over them, extracting matching rows from the original data frame, applying table, and recording the size of table's output alongside the x value being checked. Is there a more elegant way? Thank you. -- View this message in context: http://n4.nabble.com/How-to-implement-a-select-distinct-x-count-distinct-y-group-by-x-for-a-data-frame-tp1288418p1288418.html Sent from the R help mailing list archive at Nabble.com.
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Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem that you are trying to solve?