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sparsematrix.bsky.social
Sparse Matrix
@sparsematrix.bsky.social
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matrix from https://sparse.tamu.edu/
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sparsematrix.bsky.social
Jacobian from Bank of Canada 'jan99' model, oldstack 080

Size: 27534x27534
Nonzeros: 151063

Kind: Economic Problem
Author: P. Hollinger
Date: 2001
Link: https://sparse.tamu.edu/Hollinger/jan99jac080
Sparse Matrix of size 27534x27534 by P. Hollinger.
February 9, 2026 at 6:00 PM
sparsematrix.bsky.social
2005 web crawl of Arabic domains

Size: 22744080x22744080
Nonzeros: 639999458

Kind: Directed Graph
Author: Laboratory for Web Algorithmics (LAW), Universita degli Studi di Milano, http://law.di.unimi.it/index.php
Date: 2005
Link: https://sparse.tamu.edu/LAW/arabic-2005
Sparse Matrix of size 22744080x22744080 by Laboratory for Web Algorithmics (LAW), Universita degli Studi di Milano, http://law.di.unimi.it/index.php.
February 9, 2026 at 12:00 PM
sparsematrix.bsky.social
UNSYMMETRIC MATRIX MAHINDAS ST ERTAR 24OCT84

Size: 1258x1258
Nonzeros: 7682

Kind: Economic Problem
Author: K. Pearson
Date: 1984
Link: https://sparse.tamu.edu/HB/mahindas
Sparse Matrix of size 1258x1258 by K. Pearson.
February 9, 2026 at 6:01 AM
sparsematrix.bsky.social
Power flow Jacobian for a synthetic 10,000-bus power grid

Size: 20000x20000
Nonzeros: 135888

Kind: Power Network Problem
Author: A. B. Birchfield, T. J. Overbye
Date: 2018
Link: https://sparse.tamu.edu/TAMU_SmartGridCenter/ACTIVSg10K
Sparse Matrix of size 20000x20000 by A. B. Birchfield, T. J. Overbye.
February 9, 2026 at 12:03 AM
sparsematrix.bsky.social
S.Norris, Univ. Auckland. FEM, Laplace eqn 2D 100x100 mesh

Size: 9604x9604
Nonzeros: 85264

Kind: 2D/3D Problem
Author: S. Norris
Date: 2003
Link: https://sparse.tamu.edu/Norris/fv1
Sparse Matrix of size 9604x9604 by S. Norris.
February 8, 2026 at 6:00 PM
sparsematrix.bsky.social
Random matrix, 1% uniformly distributed. G25=pattern of G30

Size: 2000x2000
Nonzeros: 39980

Kind: Undirected Random Graph
Author: C. Helmberg
Date: 1996
Link: https://sparse.tamu.edu/Gset/G25
Sparse Matrix of size 2000x2000 by C. Helmberg.
February 8, 2026 at 12:00 PM
sparsematrix.bsky.social
Forests and Trees from Nicolas Thiery

Size: 95368x123867
Nonzeros: 1597545

Kind: Combinatorial Problem
Author: N. Thiery
Date: 2008
Link: https://sparse.tamu.edu/JGD_Forest/TF18
Sparse Matrix of size 95368x123867 by N. Thiery.
February 8, 2026 at 6:01 AM
sparsematrix.bsky.social
SNAP network: Youtube social network and ground-truth communities

Size: 1134890x1134890
Nonzeros: 5975248

Kind: Undirected Graph With Communities
Author: J. Yang, J. Leskovec
Date: 2012
Link: https://sparse.tamu.edu/SNAP/com-Youtube
Sparse Matrix of size 1134890x1134890 by J. Yang, J. Leskovec.
February 8, 2026 at 12:04 AM
sparsematrix.bsky.social
Oberwolfach: axi-symmetryic infinite el.

Size: 2025x2025
Nonzeros: 100015

Kind: Model Reduction Problem
Author: K. Meerbergen
Date: 2006
Link: https://sparse.tamu.edu/Oberwolfach/piston
Sparse Matrix of size 2025x2025 by K. Meerbergen.
February 7, 2026 at 6:00 PM
sparsematrix.bsky.social
Jacobian from MULTIMOD Mark3, oldstack 040

Size: 18289x18289
Nonzeros: 106803

Kind: Economic Problem
Author: P. Hollinger
Date: 2001
Link: https://sparse.tamu.edu/Hollinger/mark3jac040
Sparse Matrix of size 18289x18289 by P. Hollinger.
February 7, 2026 at 12:00 PM
sparsematrix.bsky.social
DIMACS10 set: kronecker/kron_g500-logn16

Size: 65536x65536
Nonzeros: 4912469

Kind: Undirected Multigraph
Author: D. Bader, J. Berry, S. Kahan, R. Murphy, E. Reidy, J. Willcock
Date: 2010
Link: https://sparse.tamu.edu/DIMACS10/kron_g500-logn16
Sparse Matrix of size 65536x65536 by D. Bader, J. Berry, S. Kahan, R. Murphy, E. Reidy, J. Willcock.
February 7, 2026 at 6:01 AM
sparsematrix.bsky.social
Sandia/oscil_dcop_47 circuit simulation matrix. Sandia National Lab.

Size: 430x430
Nonzeros: 1544

Kind: Subsequent Circuit Simulation Problem
Author: R. Hoekstra
Date: 2003
Link: https://sparse.tamu.edu/Sandia/oscil_dcop_47
Sparse Matrix of size 430x430 by R. Hoekstra.
February 7, 2026 at 12:03 AM
sparsematrix.bsky.social
Real-space pseudopotential method. Zhou, Saad, Tiago, Chelikowsky, Univ MN

Size: 185639x185639
Nonzeros: 15011265

Kind: Theoretical/Quantum Chemistry Problem
Author: Y. Zhou, Y. Saad, M. Tiago, J. Chelikowsky
Date: 2005
Link: https://sparse.tamu.edu/PARSEC/Si41Ge41H72
Sparse Matrix of size 185639x185639 by Y. Zhou, Y. Saad, M. Tiago, J. Chelikowsky.
February 6, 2026 at 6:00 PM
sparsematrix.bsky.social
Relations from Florent Hiver, Univ. Paris-Est Marne-La-Valle'e

Size: 340x35
Nonzeros: 1058

Kind: Combinatorial Problem
Author: F. Hiver
Date: 2008
Link: https://sparse.tamu.edu/JGD_Relat/relat5
Sparse Matrix of size 340x35 by F. Hiver.
February 6, 2026 at 12:00 PM
sparsematrix.bsky.social
Gould, Hu, & Scott: from Christian Damhaug

Size: 213453x213453
Nonzeros: 11985111

Kind: Structural Problem
Author: C. Damhaug
Date: 2004
Link: https://sparse.tamu.edu/DNVS/troll
Sparse Matrix of size 213453x213453 by C. Damhaug.
February 6, 2026 at 6:00 AM
sparsematrix.bsky.social
SYMMETRIC TEST MATRIX FROM MSC/NASTRAN BC4F8.OUT2

Size: 726x726
Nonzeros: 34518

Kind: Structural Problem
Author: R. Grimes
Date: 1995
Link: https://sparse.tamu.edu/Boeing/msc00726
Sparse Matrix of size 726x726 by R. Grimes.
February 6, 2026 at 12:03 AM
sparsematrix.bsky.social
Bob Sumner, MIT. a computer graphics problem

Size: 29493x11822
Nonzeros: 117954

Kind: Computer Graphics/Vision Problem
Author: R. Sumner
Date: 2003
Link: https://sparse.tamu.edu/Sumner/graphics
Sparse Matrix of size 29493x11822 by R. Sumner.
February 5, 2026 at 6:00 PM
sparsematrix.bsky.social
Sandia/fpga_dcop_21 circuit simulation matrix. Sandia National Lab.

Size: 1220x1220
Nonzeros: 5892

Kind: Subsequent Circuit Simulation Problem
Author: R. Hoekstra
Date: 2003
Link: https://sparse.tamu.edu/Sandia/fpga_dcop_21
Sparse Matrix of size 1220x1220 by R. Hoekstra.
February 5, 2026 at 12:00 PM
sparsematrix.bsky.social
linear programming problem, C. Meszaros test set

Size: 426x7195
Nonzeros: 52121

Kind: Linear Programming Problem
Author: N/A
Date: 2004
Link: https://sparse.tamu.edu/Meszaros/air05
Sparse Matrix of size 426x7195 by N/A.
February 5, 2026 at 6:00 AM
sparsematrix.bsky.social
Sandia/fpga_trans_02 circuit simulation matrix. Sandia National Lab.

Size: 1220x1220
Nonzeros: 7382

Kind: Subsequent Circuit Simulation Problem
Author: R. Hoekstra
Date: 2003
Link: https://sparse.tamu.edu/Sandia/fpga_trans_02
Sparse Matrix of size 1220x1220 by R. Hoekstra.
February 5, 2026 at 12:03 AM
sparsematrix.bsky.social
Simplicial complexes from Homology from Volkmar Welker.

Size: 120x210
Nonzeros: 840

Kind: Combinatorial Problem
Author: V. Welker
Date: 2008
Link: https://sparse.tamu.edu/JGD_Homology/n3c5-b6
Sparse Matrix of size 120x210 by V. Welker.
February 4, 2026 at 6:00 PM
sparsematrix.bsky.social
IBM TJ Watson, non-linear optimization

Size: 6611x6611
Nonzeros: 64333

Kind: Optimization Problem
Author: IBM
Date: 2006
Link: https://sparse.tamu.edu/Schenk_IBMNA/c-34
Sparse Matrix of size 6611x6611 by IBM.
February 4, 2026 at 12:00 PM
sparsematrix.bsky.social
Gnutella peer to peer network from August 24 2002

Size: 26518x26518
Nonzeros: 65369

Kind: Directed Graph
Author: M. Ripeanu and I. Foster and A. Iamnitchi
Date: 2002
Link: https://sparse.tamu.edu/SNAP/p2p-Gnutella24
Sparse Matrix of size 26518x26518 by M. Ripeanu and I. Foster and A. Iamnitchi.
February 4, 2026 at 6:01 AM
sparsematrix.bsky.social
SYMMETRIC CONNECTION TABLE FROM DTNSRDC, WASHINGTON

Size: 492x492
Nonzeros: 3156

Kind: Structural Problem
Author: G. Everstine, D. Taylor
Date: 1980
Link: https://sparse.tamu.edu/HB/dwt_492
Sparse Matrix of size 492x492 by G. Everstine, D. Taylor.
February 4, 2026 at 12:03 AM
sparsematrix.bsky.social
machine learning graph: worms20_10NN

Size: 20055x20055
Nonzeros: 240826

Kind: Undirected Weighted Graph
Author: D. Pasadakis, C.L. Alappat, O. Schenk, G. Wellein
Date: 2020
Link: https://sparse.tamu.edu/ML_Graph/worms20_10NN
Sparse Matrix of size 20055x20055 by D. Pasadakis, C.L. Alappat, O. Schenk, G. Wellein.
February 3, 2026 at 6:00 PM