R help - Feb 2010 - remove a row from a dataframe, row names disappear - solution

Thank you Sarah.I'm glad it was a quick fix:

On Fri, Feb 5, 2010 at 8:50 AM, Sarah Goslee <> wrote:
> You're not only removing a row of data, you are invoking the default
> behavior of subset, which is to collapse the subsetted result to the
> smallest possible type, which in this case is a vector. Vectors have
> no rows, and thus no row names.
>
> You need the drop=FALSE argument, as in
> ENV <- ENV[-1, , drop=FALSE]
>
> Sarah
>
> On Fri, Feb 5, 2010 at 9:44 AM, Euan Reavie <euan.reavie@gmail.com>
wrote:
> > I find this odd because it doesn't appear to happen in larger
datasets. I
> > have the following data set ENV with the first column set as
row.names:
> >
> >> ENV
> >         TPlog
> > 001S29H  0.601
> > 002S42H  0.602
> > 003S43S  0.779
> > 004S43S  0.702
> > 005S51H  0.978
> > 006S52P  2.718
> >
> > If I apply > ENV <- ENV[-1,]  # remove first row of data
(right?)
> > ...ENV comes back as:
> >
> > [1] 0.602 0.779 0.702 0.978 2.718
> >
> > So I am losing the row name info. I also notice that, if the first two
> > values in the TPlog column are the same, both values are removed!
What's
> > going on, and why does this same thing not happen in more complex
> datasets
> > with more than one column of values?
> >
> > Many thanks - Euan.
>
>
> --
> Sarah Goslee
> http://www.functionaldiversity.org
>


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