# stack problem

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## stack problem

 stack() seems to drop empty levels.  Perhaps there could be a drop=FALSE argument if one wanted all the original levels.  In the example below, we may wish to retain level "b" in s\$ind even though component LL\$b has length 0. > LL <- list(a = 1:3, b = list()) > s <- stack(LL) > str(s) 'data.frame':   3 obs. of  2 variables:  \$ values: int  1 2 3  \$ ind   : Factor w/ 1 level "a": 1 1 1 -- Statistics & Software Consulting GKX Group, GKX Associates Inc. tel: 1-877-GKX-GROUP email: ggrothendieck at gmail.com ______________________________________________ [hidden email] mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
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## Re: stack problem

 I'll add the drop argument but I'm wondering about the order of the levels. Should we set the levels to unique(names(x)) or sort them, too? On Mon, Jun 27, 2016 at 10:39 AM, Gabor Grothendieck <[hidden email]> wrote: > stack() seems to drop empty levels.  Perhaps there could be a > drop=FALSE argument if one wanted all the original levels.  In the > example below, we may wish to retain level "b" in s\$ind even though > component LL\$b has length 0. > >> LL <- list(a = 1:3, b = list()) >> s <- stack(LL) >> str(s) > 'data.frame':   3 obs. of  2 variables: >  \$ values: int  1 2 3 >  \$ ind   : Factor w/ 1 level "a": 1 1 1 > > > -- > Statistics & Software Consulting > GKX Group, GKX Associates Inc. > tel: 1-877-GKX-GROUP > email: ggrothendieck at gmail.com > > ______________________________________________ > [hidden email] mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel> ______________________________________________ [hidden email] mailing list https://stat.ethz.ch/mailman/listinfo/r-devel