[Rd] New matrix function

[Duncan Murdoch]

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