[Rd] New matrix function

[Avraham Adler]

It’s rather difficult. For example, the base R Kendall tau is written with
the naive O(n^2). The much faster O(n log n) implementation was programmed
and is in the pcaPP package. When I say much faster, I mean that my
implementation in Excel VBA was faster than R for 10,000 or so pairs.
R-Core decided not to implement that code, and instead made a note about
the faster implementation living in pcaPP in the help for “cor”. See [1]
for the 2012 discussion. My point is it’s really really difficult to get
something in Base R. Develop it well, put it in a package, and you have
basically the same result.

Avi

[1] https://stat.ethz.ch/pipermail/r-devel/2012-June/064351.html

On Fri, Oct 11, 2019 at 9:55 AM Morgan Morgan <morgan.emailbox using gmail.com>
wrote:

> How do you prove usefulness of a feature?
> Do you have an example of a feature that has been added after proving to be
> useful in the package space first?
>
> Thank you,
> Morgan
>
> On Fri, 11 Oct 2019 13:53 Michael Lawrence, <lawrence.michael using gene.com>
> wrote:
>
> > Thanks for this interesting suggestion, Morgan. While there is no strict
> > criteria for base R inclusion, one criterion relevant in this case is
> that
> > the usefulness of a feature be proven in the package space first.
> >
> > Michael
> >
> >
> > On Fri, Oct 11, 2019 at 5:19 AM Morgan Morgan <morgan.emailbox using gmail.com
> >
> > wrote:
> >
> >> On Fri, 11 Oct 2019 10:45 Duncan Murdoch, <murdoch.duncan using 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
> >> >
> >>
> >>         [[alternative HTML version deleted]]
> >>
> >> ______________________________________________
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> >>
> >
> >
> > --
> > Michael Lawrence
> > Scientist, Bioinformatics and Computational Biology
> > Genentech, A Member of the Roche Group
> > Office +1 (650) 225-7760
> > michafla using gene.com
> >
> > Join Genentech on LinkedIn | Twitter | Facebook | Instagram | YouTube
> >
>
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>
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