[datatable-help] rbind() vs. rbindlist() behavior/warning

[Arunkumar Srinivasan]

GSee, I find this a bit confusing at the moment as well - the convergence of "rbind" and "rbindlist" and therefore the future of "rbindlist". 

`rbindlist` gained speed (to some extent) by assuming things like this and skipping checks in the first place. So, should we include checks like this? Also, if "rbind" and/or "rbindlist" are made to do the exact same thing, then, what's the purpose of "rbindlist"?

Any thoughts? 

Arun


On Saturday, November 9, 2013 at 6:29 PM, Eduard Antonyan wrote:

> Fyi, it's not well documented, but setting use.names=FALSE in rbind would replicate rbindlist behavior.
> I think it's a reasonable FR - if/when all of rbind code goes into C, it would be trivial to add. 
> On Nov 9, 2013 10:51 AM, "G See" <gsee000 at gmail.com (mailto:gsee000 at gmail.com)> wrote:
> > Hi,
> > 
> > Please note the inconsistency between the behavior of rbind() and
> > rbindlist() below.
> > 
> > m1 <- as.data.table(mtcars)
> > m2 <- copy(m1)
> > rbind(m1[, .SD[1], by=cyl], m2) # Gives warning and binds by name
> > rbindlist(list(m1[, .SD[1], by=cyl], m2)) # no warning, and does NOT
> > bind by name
> > 
> > What do you think about making them have the same behavior and/or
> > warning?  Personally, I prefer the behavior of rbind(), and would
> > prefer to see a warning if column names are ignored like they are with
> > rbindlist().
> > 
> > Thanks,
> > Garrett
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