Sparse Matrix
LightNews LightNews
banner
sparsematrix.bsky.social
Sparse Matrix
@sparsematrix.bsky.social
33 followers 21 following 1.6K posts
bot by @moustiluigi.bsky.social & @anzowo.bsky.social
posts every 6h
matrix from https://sparse.tamu.edu/
Posts Replies Media Videos
sparsematrix.bsky.social
DIMACS10 set: walshaw/t60k

Size: 60005x60005
Nonzeros: 178880

Kind: Undirected Graph
Author: C. Walshaw
Date: 2000
Link: https://sparse.tamu.edu/DIMACS10/t60k
Sparse Matrix of size 60005x60005 by C. Walshaw.
December 5, 2025 at 6:00 PM
sparsematrix.bsky.social
Pajek network: Slovenian journals 1999-2000

Size: 124x124
Nonzeros: 12068

Kind: Undirected Weighted Graph
Author: CATI Center Ljubljana
Date: 2000
Link: https://sparse.tamu.edu/Pajek/Journals
Sparse Matrix of size 124x124 by CATI Center Ljubljana.
December 5, 2025 at 12:00 PM
sparsematrix.bsky.social
transient optimal power flow, Reduced-Space. Guangchao Geng, Zhejiang Univ

Size: 35696x35696
Nonzeros: 8781949

Kind: Power Network Problem
Author: G. Geng
Date: 2009
Link: https://sparse.tamu.edu/TSOPF/TSOPF_RS_b678_c2
Sparse Matrix of size 35696x35696 by G. Geng.
December 5, 2025 at 6:00 AM
sparsematrix.bsky.social
BUCKLING PROBLEM FOR CONTAINER MODEL, ARTHUR RAEFSKY, CENTRIC ENG.

Size: 19779x19779
Nonzeros: 1316789

Kind: Structural Problem
Author: A. Raefsky
Date: 1993
Link: https://sparse.tamu.edu/Simon/raefsky4
Sparse Matrix of size 19779x19779 by A. Raefsky.
December 5, 2025 at 12:03 AM
sparsematrix.bsky.social
Power simulation matrix, Li Peijie, Inst. of Power Systems, Guangxi Univ.

Size: 9774x9774
Nonzeros: 820783

Kind: Power Network Problem
Author: L. Peijie
Date: 2011
Link: https://sparse.tamu.edu/IPSO/TSC_OPF_300
Sparse Matrix of size 9774x9774 by L. Peijie.
December 4, 2025 at 6:00 PM
sparsematrix.bsky.social
Simplicial complexes from Homology from Volkmar Welker.

Size: 30x120
Nonzeros: 240

Kind: Combinatorial Problem
Author: V. Welker
Date: 2008
Link: https://sparse.tamu.edu/JGD_Homology/n3c5-b7
Sparse Matrix of size 30x120 by V. Welker.
December 4, 2025 at 12:00 PM
sparsematrix.bsky.social
Netlib LP problem ken_07: minimize c'*x, where Ax=b, lo<=x<=hi

Size: 2426x3602
Nonzeros: 8404

Kind: Linear Programming Problem
Author: J. Kennington
Date: 1991
Link: https://sparse.tamu.edu/LPnetlib/lp_ken_07
Sparse Matrix of size 2426x3602 by J. Kennington.
December 4, 2025 at 6:00 AM
sparsematrix.bsky.social
Unsymmetric Matrix bayer09, Bayer AG, F. Grund, May 1995.

Size: 3083x3083
Nonzeros: 11767

Kind: Chemical Process Simulation Problem
Author: Bayer
Date: 1997
Link: https://sparse.tamu.edu/Grund/bayer09
Sparse Matrix of size 3083x3083 by Bayer.
December 4, 2025 at 12:02 AM
sparsematrix.bsky.social
transient optimal power flow, Full-Space. Guangchao Geng, Zhejiang Univ

Size: 14454x14454
Nonzeros: 147972

Kind: Power Network Problem
Author: G. Geng
Date: 2009
Link: https://sparse.tamu.edu/TSOPF/TSOPF_FS_b9_c6
Sparse Matrix of size 14454x14454 by G. Geng.
December 3, 2025 at 6:00 PM
sparsematrix.bsky.social
Mycielskian graph M3

Size: 5x5
Nonzeros: 10

Kind: Undirected Graph
Author: J. Mycielski
Date: 2018
Link: https://sparse.tamu.edu/Mycielski/mycielskian3
Sparse Matrix of size 5x5 by J. Mycielski.
December 3, 2025 at 12:00 PM
sparsematrix.bsky.social
PWT: Nasa matrix, but with a diagonal added to the original matrix

Size: 36519x36519
Nonzeros: 326107

Kind: Duplicate Structural Problem
Author: NASA
Date: 1995
Link: https://sparse.tamu.edu/GHS_psdef/pwt
Sparse Matrix of size 36519x36519 by NASA.
December 3, 2025 at 6:01 AM
sparsematrix.bsky.social
Simplicial complexes from Homology from Volkmar Welker.

Size: 2511x4935
Nonzeros: 25110

Kind: Combinatorial Problem
Author: V. Welker
Date: 2008
Link: https://sparse.tamu.edu/JGD_Homology/n3c6-b9
Sparse Matrix of size 2511x4935 by V. Welker.
December 3, 2025 at 12:03 AM
sparsematrix.bsky.social
AutoForm Eng., Zurich. indefinite. sheet metal forming

Size: 1508065x1508065
Nonzeros: 52259885

Kind: Structural Problem
Author: AutoForm Eng.
Date: 2006
Link: https://sparse.tamu.edu/Schenk_AFE/af_shell10
Sparse Matrix of size 1508065x1508065 by AutoForm Eng..
December 2, 2025 at 6:01 PM
sparsematrix.bsky.social
Oberwolfach: micropyros thruster, A matrix

Size: 11445x11445
Nonzeros: 176117

Kind: Duplicate Model Reduction Problem
Author: E. Rudnyi
Date: 2004
Link: https://sparse.tamu.edu/Oberwolfach/t2dah_a
Sparse Matrix of size 11445x11445 by E. Rudnyi.
December 2, 2025 at 12:00 PM
sparsematrix.bsky.social
Simplicial complexes from Homology from Volkmar Welker.

Size: 4340x2852
Nonzeros: 26040

Kind: Combinatorial Problem
Author: V. Welker
Date: 2008
Link: https://sparse.tamu.edu/JGD_Homology/n4c5-b5
Sparse Matrix of size 4340x2852 by V. Welker.
December 2, 2025 at 6:00 AM
sparsematrix.bsky.social
Simplicial complexes from Homology from Volkmar Welker.

Size: 1260x378
Nonzeros: 3780

Kind: Combinatorial Problem
Author: V. Welker
Date: 2008
Link: https://sparse.tamu.edu/JGD_Homology/mk9-b2
Sparse Matrix of size 1260x378 by V. Welker.
December 2, 2025 at 12:03 AM
sparsematrix.bsky.social
Problematic linear programming problem, Meszaros test set

Size: 2701x16281
Nonzeros: 52070

Kind: Linear Programming Problem
Author: N/A
Date: 2004
Link: https://sparse.tamu.edu/Meszaros/l30
Sparse Matrix of size 2701x16281 by N/A.
December 1, 2025 at 6:00 PM
sparsematrix.bsky.social
SPLATZMAN FINITE DIFFERENCE MODEL OF ATLANTICOCEAN

Size: 362x362
Nonzeros: 5786

Kind: 2D/3D Problem
Author: J. Lewis
Date: 1975
Link: https://sparse.tamu.edu/HB/plat362
Sparse Matrix of size 362x362 by J. Lewis.
December 1, 2025 at 12:00 PM
sparsematrix.bsky.social
freeFlyingRobot optimal control problem (matrix 14 of 16)

Size: 5958x5958
Nonzeros: 43298

Kind: Optimal Control Problem
Author: B. Senses, A. Rao
Date: 2015
Link: https://sparse.tamu.edu/VDOL/freeFlyingRobot_14
Sparse Matrix of size 5958x5958 by B. Senses, A. Rao.
December 1, 2025 at 6:00 AM
sparsematrix.bsky.social
GT01R: 2D inviscid case. F. Pacull, Lyon, France

Size: 7980x7980
Nonzeros: 430909

Kind: Computational Fluid Dynamics Problem
Author: F. Pacull
Date: 2010
Link: https://sparse.tamu.edu/Fluorem/GT01R
Sparse Matrix of size 7980x7980 by F. Pacull.
December 1, 2025 at 12:03 AM
sparsematrix.bsky.social
Uedge Test Matrix

Size: 3060x3060
Nonzeros: 42211

Kind: Electromagnetics Problem
Author: Y. Saad
Date: 1996
Link: https://sparse.tamu.edu/TOKAMAK/utm3060
Sparse Matrix of size 3060x3060 by Y. Saad.
November 30, 2025 at 6:00 PM
sparsematrix.bsky.social
Newton-Schultz iteration, Z_k+1=Z_k+(1/2)*(I-(Z_k)^2)*Z_k. This is Z_04

Size: 9506x9506
Nonzeros: 394808

Kind: Subsequent Theoretical/Quantum Chemistry Problem
Author: K. Nemeth
Date: 1999
Link: https://sparse.tamu.edu/Nemeth/nemeth04
Sparse Matrix of size 9506x9506 by K. Nemeth.
November 30, 2025 at 12:00 PM
sparsematrix.bsky.social
circuitscape: circuit theory applied to animal/gene flow. B. McRae, UCSB

Size: 1000000x1000000
Nonzeros: 4996000

Kind: 2D/3D Problem
Author: B. McRae
Date: 2008
Link: https://sparse.tamu.edu/McRae/ecology1
Sparse Matrix of size 1000000x1000000 by B. McRae.
November 30, 2025 at 6:00 AM
sparsematrix.bsky.social
3D Finite element matrix, magnetohydrodynamic problem with 5 variables

Size: 22695x22695
Nonzeros: 1350309

Kind: Duplicate Electromagnetics Problem
Author: B. Li
Date: 1999
Link: https://sparse.tamu.edu/Li/pli
Sparse Matrix of size 22695x22695 by B. Li.
November 30, 2025 at 12:04 AM
sparsematrix.bsky.social
Rajat/rajat19 circuit simulation matrix

Size: 1157x1157
Nonzeros: 3699

Kind: Circuit Simulation Problem
Author: Rajat
Date: 2006
Link: https://sparse.tamu.edu/Rajat/rajat19
Sparse Matrix of size 1157x1157 by Rajat.
November 29, 2025 at 6:00 PM