[Rd] New matrix function

[Morgan Morgan]

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.

Thank you
Best regards,
Morgan

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