Chris, It's not filed as a FR, IIRC. It's filed under "Internals".
Arun On Wednesday, September 11, 2013 at 11:31 AM, Chris Neff wrote: > Yes, dropping names altogether in data.table would fix this, and would be the > cleanest thing overall since as is said in that thread data.table doesn't > really work with rownames in mind anyway. > > Except it is less of a FR now and more of a bad bug because you can get > segfaults from it. > > > On Wed, Sep 11, 2013 at 5:24 AM, Arunkumar Srinivasan <[email protected] > (mailto:[email protected])> wrote: > > Most likely, this > > (https://r-forge.r-project.org/tracker/index.php?func=detail&aid=4882&group_id=240&atid=5335), > > when fixed, will take care of it? > > > > Arun > > > > > > On Wednesday, September 11, 2013 at 11:17 AM, Chris Neff wrote: > > > > > > > > > Indeed, it shows that k1 and k2 both have names of length 2, and both > > > times the value of names is just the variable names. > > > > > > Where the names are getting added is by apply. What the issue with > > > data.table is that it does not ignore names from short variables. I now > > > have a small reproducible example I can share: > > > > > > d <- data.frame(x=1:5) > > > > > > f <- function(x) {data.table(x=x, y=1:10)} > > > > > > l <- apply(d, 1, f) > > > > > > lapply(l, function(x) lapply(x, names)) # All values of x have a name > > > > > > a <- rbindlist(l) # a$x will segfault after this > > > > > > > > > The underlying issue is what data.table and data.frame do with rownames > > > and recycling. Look at this simple case: > > > > > > x <- 1:5 > > > names(x) <- letters[1:5] > > > > > > df <- data.frame(x=x, y=1:10) > > > #Warning message: > > > # In data.frame(x = x, y = 1:10) : > > > # row names were found from a short variable and have been discarded > > > > > > lapply(df, names) # no names > > > > > > dt <- data.table(x=x, y=1:1) # No warning > > > > > > lapply(dt, names) # x has names, and they get recycled. > > > > > > > > > So data.table needs to follow data.frame logic for discarding row names > > > when they would otherwise be recycled. > > > > > > > > > Bug submitted here: > > > https://r-forge.r-project.org/tracker/index.php?func=detail&aid=4890&group_id=240&atid=975 (https://r-forge.r-project.org/tracker/index.php?func=detail&aid=4890&group_id=240&atid=975)> > > > > > I'm surprised this has never arisen before, it seems like something that > > > has been around forever. > > > > > > > > > > > > > > > _______________________________________________ > > > datatable-help mailing list > > > [email protected] > > > (mailto:[email protected]) > > > https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/datatable-help > > > > > > > > > > > > > > > > >
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