Just for completeness, all this is well documented:
CSV files:
By default there is no column name for a column of row names. If
‘col.names = NA’ and ‘row.names = TRUE’ a blank column name is
added, which is the convention used for CSV files to be read by
spreadsheets. Note that such CSV files can be read in R by
read.csv(file = "<filename>", row.names = 1)
Cheers,
Simon
> On 2/07/2021, at 10:29 AM, Gabriel Becker <gabembec...@gmail.com> wrote:
>
>
>
> On Thu, Jul 1, 2021 at 1:46 PM Stephen Ellison <s.elli...@lgcgroup.com> wrote:
>
> Please run the reproducible example provided.
> When you do, you will see that write.csv writes an unnecessary empty header
> field ("") over the row names column. This makes the number of header fields
> equal to the number of columns _including_ row names. That causes the
> original row names to be read as data by read.csv, following the rule that
> the number of header fields determines whether row names are present.
> read.csv accordingly assumes that the former row names are unnamed data,
> calls the unnamed row names column "X" (or X.1 etc if X exists) and then adds
> new, default, row names _instead of the original row names written by
> write.csv_.
> That's not helpful.
>
> This depends on if you are reading the csv via R or something else, I would
> imagine. It not being "valid" CSV at all would likely cause some programs to
> choke entirely, I expect. I admit that's conjecture though, I don't have data
> on that one way or another.
>
> ~G
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