You're probably expecting the by-without-by behavior - see this post: http://r.789695.n4.nabble.com/by-EACHI-and-related-please-check-ok-td4686732.htmland follow the links within for more detail.
On Mon, Mar 24, 2014 at 2:37 PM, Shir Levkowitz <[email protected]>wrote: > It looks like the latest version of data.table has changed the behavior of > list( ) inside of a join - is this behavior as expected? Has anyone > reported or encountered this change? It seems like a bug to me. I am using > data.table v1.9.2 in R 3.2.0 . > > Thanks, > Shir Levkowitz > > > > > > #----------------------------------------------- > > > library(data.table) > > # dates > dt.dateEx <- data.table(date = as.character(seq(as.Date('2014-04-01'), > as.Date('2014-04-15'), by = 1))) > setkey(dt.dateEx, date) > > # hours > dt.hrEx <- copy(dt.dateEx) > dt.hrEx <- dt.hrEx[, list(hour_beginning =0:23), by = list(dt = date)] # > rep x24 per date > setkey(dt.hrEx, dt, hour_beginning) > > # as expected > dt.classEx[dt.dateEx][, list(dt, hour_beginning)] > > # not expected outcome > dt.classEx[dt.dateEx, list(hour_beginning)] > > _______________________________________________ > datatable-help mailing list > [email protected] > https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/datatable-help >
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