[Rd] New matrix function

Morgan Morgan
Fri, 11 Oct 2019 15:16:01 -0000

On Fri, 11 Oct 2019 10:45 Duncan Murdoch, <murdoch.duncan at gmail.com>
wrote:

> On 11/10/2019 6:44 a.m., Morgan Morgan wrote:
> > Hi All,
> >
> > I was looking for a function to find a small matrix inside a larger
> matrix
> > in R similar to the one described in the following link:
> >
> >
>
https://www.mathworks.com/matlabcentral/answers/194708-index-a-small-matrix-in-a-larger-matrix
> >
> > I couldn't find anything.
> >
> > The above function can be seen as a "generalisation" of the
"which"
> > function as well as the function described in the following post:
> >
> >
>
https://coolbutuseless.github.io/2018/04/03/finding-a-length-n-needle-in-a-haystack/
> >
> > Would be possible to add such a function to base R?
> >
> > I am happy to work with someone from the R core team (if you wish) and
> > suggest an implementation in C.
>
> That seems like it would sometimes be a useful function, and maybe
> someone will point out a package that already contains it.  But if not,
> why would it belong in base R?
>

If someone already implemented it, that would great indeed. I think it is a
very general and basic function, hence base R could be a good place for it?

But this is probably not a good reason; maybe someone from the R core team
can shed some light on how they decide whether or not to include a function
in base R?


> Duncan Murdoch