David Brahm <[EMAIL PROTECTED]> writes: > In R-patched_2003-10-20, subsetted 1-D arrays no longer get converted to > vectors. The NEWS file documents this change, as an indirect result of bug > report 4110. I just wanted to mention this can break code in some rather > obscure ways, such as this toy example: > > R> x <- sort(tapply(1:8, rep(1:4,2), sum)) # Was vector, now is 1D array > R> y <- matrix(1:4, 1,4) # 1x4 matrix > R> x + y # Used to return a 1x4 matrix > Error in x + y : non-conformable arrays
Without the sort() that was an error in 1.8.0 too. However, we've found other surprises like prop.trend.test(tt[1,], margin.table(tt,2)) which internally will pass a 1D array as weights to lm. > I agree with the change, but I would beware that some puzzled users may not > associate new "tapply problems" with this news item. Yep. And I tend to agree that the original problem had to be fixed. > Also, *should* you be able to add a (4) array to a (1,4) array? ...or to a (4,1) array? Currently the answer is clearly neither: if both terms have dimensions, the dimensions must match. It is kind of tempting though. -- O__ ---- Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-devel
