[GRASS-dev] calculating inverse matrix

[Michael Barton]

No it does not. It uses new grass python libraries to initiate multiple processes on different cores.

Michael
______________________________
C. Michael Barton
Director, Center for Social Dynamics & Complexity
Professor of Anthropology, School of Human Evolution & Social Change
Arizona State University
Tempe, AZ  85287-2402
USA

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On Mar 26, 2013, at 10:41 AM, "Newcomb, Doug" <doug_newcomb at fws.gov<mailto:doug_newcomb at fws.gov>>
 wrote:

Does that require compiling with OpenMP?
Doug

On Tue, Mar 26, 2013 at 1:27 PM, Michael Barton <Michael.Barton at asu.edu<mailto:Michael.Barton at asu.edu>> wrote:
i.pan.sharpen contains python code to do an inverse pca. It uses some of the new r.mapcalc capabilities to do parallel processing on multi-core processors. So it's pretty fast.

Michael
____________________
C. Michael Barton
Director, Center for Social Dynamics & Complexity
Professor of Anthropology, School of Human Evolution & Social Change
Arizona State University

voice:  480-965-6262 (SHESC), 480-727-9746 (CSDC)
fax:          480-965-7671 (SHESC),  480-727-0709 (CSDC)
www: http://www.public.asu.edu/~cmbarton, http://csdc.asu.edu<http://csdc.asu.edu/>











On Mar 26, 2013, at 4:24 AM, <grass-dev-request at lists.osgeo.org<mailto:grass-dev-request at lists.osgeo.org>>
 wrote:

From: Martin Landa <landa.martin at gmail.com<mailto:landa.martin at gmail.com>>
Subject: [GRASS-dev] calculating inverse matrix
Date: March 26, 2013 4:20:08 AM MST
To: GRASS developers list <grass-dev at lists.osgeo.org<mailto:grass-dev at lists.osgeo.org>>


Hi all,

I found several methods in GRASS code which compute inverse matrix

1) v.generalize

http://trac.osgeo.org/grass/browser/grass/trunk/vector/v.generalize/matrix.c#L134

2) i.orto.photo

http://trac.osgeo.org/grass/browser/grass/trunk/imagery/i.ortho.photo/lib/m_inverse.c#L16

3) GMath lib (depends on lapack/blas)

http://trac.osgeo.org/grass/browser/grass/trunk/lib/gmath/la.c#L566

It would be nice to consolidate it including data structures (modules
noted above define their own data structures for matrix). In other
worlds to incorporate v.generalize/i.orto.photo code into GMath lib.
Any pointers here?

Thanks, Martin

--
Martin Landa <landa.martin gmail.com<http://gmail.com/>> * http://geo.fsv.cvut.cz/~landa



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--
Doug Newcomb
USFWS
Raleigh, NC
919-856-4520 ext. 14 doug_newcomb at fws.gov<mailto:doug_newcomb at fws.gov>
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The opinions I express are my own and are not representative of the official policy of the U.S.Fish and Wildlife Service or Dept. of the Interior.   Life is too short for undocumented, proprietary data formats.

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