From morg@n@em@||box @end|ng |rom gm@||@com  Fri Oct 11 17:16:01 2019
From: morg@n@em@||box @end|ng |rom gm@||@com (Morgan Morgan)
Date: Fri, 11 Oct 2019 16:16:01 +0100
Subject: [Rd] New matrix function
In-Reply-To: <43cbad8a-af09-0a9d-c66d-2476aee555aa@gmail.com>
References: <CAL0QV_OHN1+c2ZMO28v9gB1Y-0c+2zL57bDCgcZse13bZ8--eQ@mail.gmail.com>
 <43cbad8a-af09-0a9d-c66d-2476aee555aa@gmail.com>
Message-ID: <CAL0QV_PcL25UttJNJF9ED-xj5z1gBHHSHozG584=WDW6uzUXRw@mail.gmail.com>

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
>

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[Rd] New matrix function
Morgan Morgan