[Rd] bug in rbind?

[Martin Maechler]

With thanks to Krzysztof Banas (and Joshua Ulrich),

Almost 2.5 years ago, there's been a bug report that never made
it to  https://bugs.r-project.org/  and has been forgotten
... until I've stumbled over this again.

I've found an easy fix (and improved readability also by adding
comments) and committed the fix to R-devel rev 76612 , planned
to be ported to   R 3.6.0 patched   a bit later.

Thank you once more!
Martin

--
Martin Maechler
ETH Zurich  and  R Core Team


>>>>> Joshua Ulrich 
>>>>>     on Sat, 21 Jan 2017 11:58:18 -0600 writes:

    > I'm not sure whether or not this is a bug, but I did isolate the line
    > where the error is thrown:
    > src/library/base/R/dataframe.R:1395.
    > https://github.com/wch/r-source/blob/01374c3c367fa12f555fd354f735a6e16e5bd98e/src/library/base/R/dataframe.R#L1395

    > The error is thrown because the line attempts to set a subset of the
    > rownames to NULL, which fails.

    R> options(error = recover)
    R> rbind(dfm.names, dfm)
    > Error in rownames(value[[jj]])[ri] <- rownames(xij) :
    > replacement has length zero

    > Enter a frame number, or 0 to exit

    > 1: rbind(dfm.names, dfm)
    > 2: rbind(deparse.level, ...)

    > Selection: 2
    > Called from: top level
    > Browse[1]> rownames(value[[jj]])
    > [1] "a" "b" "c" NA  NA  NA
    > Browse[1]> rownames(xij)
    > NULL
    > Browse[1]> ri
    > [1] 4 5 6
    > Browse[1]> rownames(value[[jj]])[ri]
    > [1] NA NA NA


    > On Mon, Jan 16, 2017 at 7:50 PM, Krzysztof Banas <krzysztof using nus.edu.sg> wrote:
    >> I suspect there may be a bug in base::rbind.data.frame
    >> 
    >> Below there is minimal example of the problem:
    >> 
    >> m <- matrix (1:12, 3)
    >> dfm <- data.frame (c = 1 : 3, m = I (m))
    >> str (dfm)
    >> 
    >> m.names <- m
    >> rownames (m.names) <- letters [1:3]
    >> dfm.names <- data.frame (c = 1 : 3, m = I (m.names))
    >> str (dfm.names)
    >> 
    >> rbind (m, m.names)
    >> rbind (m.names, m)
    >> rbind (dfm, dfm.names)
    >> 
    >> #not working
    >> rbind (dfm.names, dfm)
    >> 
    >> Error in rbind(deparse.level, ...) : replacement has length zero
    >> 
    >> rbind (dfm, dfm.names)$m
    >> 
    >> 
    >> [,1] [,2] [,3] [,4]
    >> 
    >> <NA>    1    4    7   10
    >> 
    >> <NA>    2    5    8   11
    >> 
    >> <NA>    3    6    9   12
    >> 
    >> a       1    4    7   10
    >> 
    >> b       2    5    8   11
    >> 
    >> c       3    6    9   12
    >> 
    >> 
    >> 
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    > -- 
    > Joshua Ulrich  |  about.me/joshuaulrich
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