From morg@n@em@||box @end|ng |rom gm@||@com  Sat Oct 12 05:14:28 2019
From: morg@n@em@||box @end|ng |rom gm@||@com (Morgan Morgan)
Date: Sat, 12 Oct 2019 04:14:28 +0100
Subject: [Rd] New matrix function
In-Reply-To: <CAP01uRkmkD+yrZVwAtgR-ZcvVbGHXmtf4cU5-mA4+31-zV8Xzg@mail.gmail.com>
References: <CAL0QV_OHN1+c2ZMO28v9gB1Y-0c+2zL57bDCgcZse13bZ8--eQ@mail.gmail.com>
 <65fd0c92-3711-cb7e-09cf-35f9896663b8@fredhutch.org>
 <CAP01uRkmkD+yrZVwAtgR-ZcvVbGHXmtf4cU5-mA4+31-zV8Xzg@mail.gmail.com>
Message-ID: <CAL0QV_Pn3zinBDi32Q=k95yjtfehZ4OCiPH7W5BpG1cmoSDB7Q@mail.gmail.com>

Basically the problem is to find the position of a submatrix inside a
larger matrix. Here are some links describing the problem:

https://stackoverflow.com/questions/10529278/fastest-way-to-find-a-m-x-n-submatrix-in-m-x-n-matrix

https://stackoverflow.com/questions/16750739/find-a-matrix-in-a-big-matrix

Best
Morgan

On Fri, 11 Oct 2019 23:36 Gabor Grothendieck, <ggrothendieck at gmail.com>
wrote:

> The link you posted used the same inputs as in my example. If that is
> not what you meant maybe
> a different example is needed.
> Regards.
>
> On Fri, Oct 11, 2019 at 2:39 PM Pages, Herve <hpages at fredhutch.org> wrote:
> >
> > Has someone looked into the image processing area for this? That sounds
> > a little bit too high-level for base R to me (and I would be surprised
> > if any mainstream programming language had this kind of functionality
> > built-in).
> >
> > H.
> >
> > On 10/11/19 03:44, 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://urldefense.proofpoint.com/v2/url?u=https-3A__www.mathworks.com_matlabcentral_answers_194708-2Dindex-2Da-2Dsmall-2Dmatrix-2Din-2Da-2Dlarger-2Dmatrix&d=DwICAg&c=eRAMFD45gAfqt84VtBcfhQ&r=BK7q3XeAvimeWdGbWY_wJYbW0WYiZvSXAJJKaaPhzWA&m=v96tqHMO3CLNBS7KTmdshM371i6W_v8_2H5bdVy_KHo&s=9Eu0WySIEzrWuYXFhwhHETpZQzi6hHLd84DZsbZsXYY&e=
> > >
> > > 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://urldefense.proofpoint.com/v2/url?u=https-3A__coolbutuseless.github.io_2018_04_03_finding-2Da-2Dlength-2Dn-2Dneedle-2Din-2Da-2Dhaystack_&d=DwICAg&c=eRAMFD45gAfqt84VtBcfhQ&r=BK7q3XeAvimeWdGbWY_wJYbW0WYiZvSXAJJKaaPhzWA&m=v96tqHMO3CLNBS7KTmdshM371i6W_v8_2H5bdVy_KHo&s=qZ3SJ8t8zEDA-em4WT7gBmN66qvvCKKKXRJunoF6P3k&e=
> > >
> > > 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
> > >
> > >       [[alternative HTML version deleted]]
> > >
> > > ______________________________________________
> > > R-devel at r-project.org mailing list
> > >
> https://urldefense.proofpoint.com/v2/url?u=https-3A__stat.ethz.ch_mailman_listinfo_r-2Ddevel&d=DwICAg&c=eRAMFD45gAfqt84VtBcfhQ&r=BK7q3XeAvimeWdGbWY_wJYbW0WYiZvSXAJJKaaPhzWA&m=v96tqHMO3CLNBS7KTmdshM371i6W_v8_2H5bdVy_KHo&s=tyVSs9EYVBd_dmVm1LSC23GhUzbBv8ULvtsveo-COoU&e=
> > >
> >
> > --
> > Herv? Pag?s
> >
> > Program in Computational Biology
> > Division of Public Health Sciences
> > Fred Hutchinson Cancer Research Center
> > 1100 Fairview Ave. N, M1-B514
> > P.O. Box 19024
> > Seattle, WA 98109-1024
> >
> > E-mail: hpages at fredhutch.org
> > Phone:  (206) 667-5791
> > Fax:    (206) 667-1319
> > ______________________________________________
> > R-devel at r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-devel
>
>
>
> --
> Statistics & Software Consulting
> GKX Group, GKX Associates Inc.
> tel: 1-877-GKX-GROUP
> email: ggrothendieck at gmail.com
>

	[[alternative HTML version deleted]]



[Rd] New matrix function
Morgan Morgan