From hp@ge@ @end|ng |rom |redhutch@org  Fri Oct 11 20:39:04 2019
From: hp@ge@ @end|ng |rom |redhutch@org (Pages, Herve)
Date: Fri, 11 Oct 2019 18:39:04 +0000
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: <65fd0c92-3711-cb7e-09cf-35f9896663b8@fredhutch.org>

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


[Rd] New matrix function
Pages, Herve