From murdoch@dunc@n @end|ng |rom gm@||@com  Fri Oct 11 11:45:46 2019
From: murdoch@dunc@n @end|ng |rom gm@||@com (Duncan Murdoch)
Date: Fri, 11 Oct 2019 05:45:46 -0400
Subject: [Rd] New matrix function
In-Reply-To: <CAL0QV_OHN1+c2ZMO28v9gB1Y-0c+2zL57bDCgcZse13bZ8--eQ@mail.gmail.com>
References: <CAL0QV_OHN1+c2ZMO28v9gB1Y-0c+2zL57bDCgcZse13bZ8--eQ@mail.gmail.com>
Message-ID: <43cbad8a-af09-0a9d-c66d-2476aee555aa@gmail.com>

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?

Duncan Murdoch



[Rd] New matrix function
Duncan Murdoch