[Rd] New R version - Issue with as.vector coercion on data.frame

[Hugh Parsonage]

This is intended. From NEWS, a simple text search for "as.vector" reveals

> as.vector() gains a data.frame method which returns a simple named list, also clearing a long standing ‘FIXME’ to enable as.vector(<data.frame>, mode="list"). This breaks code relying on as.vector(<data.frame>) to return the unchanged data frame.

On Mon, 2 May 2022 at 19:19, Marc Weibel <marc.weibel using eniso-partners.com> wrote:
>
> Hi
>
> I recently upgraded to the latest r version and got an issue with the command as.vector() on a data.frame object. With the previous R version the returned object was a vector but now it is formatted as a list (see below)
>
>
> > futures_quotes
>   SMI Future SMIM Future Euro Stoxx 50 Future S&P 500 Mini Future FTSE 100 Future Nikkei 225 Future
> 1      11999        2871                 3692                4150            7419             26853
> > class(futures_quotes)
> [1] "data.frame"
>
> > as.vector(futures_quotes[1,1:3])
> $`SMI Future`
> [1] 11999
>
> $`SMIM Future`
> [1] 2871
>
> $`Euro Stoxx 50 Future`
> [1] 3692
>
> > class(as.vector(futures_quotes[1,1:3]))
> [1] "list"
>
>
> Can you help me on this ? (I solved the issue temporarily with as.vector(t(futures_quotes[1,1:3]))
>
> Kind regards
> Marc Weibel
>
>
>
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