I encountered the following behavior with data.table 1.8.10 on R 3.0.2 on Mac OS X and was wondering if that is expected: > dt1 = data.table(a=character()) > dt2 = data.table(a=character()) > dt1 Empty data.table (0 rows) of 1 col: a > colnames(dt1) [1] "a" > dt2 Empty data.table (0 rows) of 1 col: a > colnames(dt2) [1] "a" > rbind(dt1, dt2) Error in setnames(ret, nm.original) : x has no column names Enter a frame number, or 0 to exit 1: rbind(dt1, dt2) 2: rbind(deparse.level, ...) 3: data.table::.rbind.data.table(...) 4: setnames(ret, nm.original) If I rbind two zero-row data.table objects with matching column names, I would have expected to get a zero-row data.table back (0 + 0 = 0, after all). -- Alexandre Sieira CISA, CISSP, ISO 27001 Lead Auditor "The truth is rarely pure and never simple." Oscar Wilde, The Importance of Being Earnest, 1895, Act I |
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