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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
Relations from Florent Hiver, Univ. Paris-Est Marne-La-Valle'e

Size: 66x12
Nonzeros: 104

Kind: Combinatorial Problem
Author: F. Hiver
Date: 2008
Link: https://sparse.tamu.edu/JGD_Relat/rel4
Sparse Matrix of size 66x12 by F. Hiver.
January 7, 2026 at 12:04 AM
sparsematrix.bsky.social
Deterministic equiv. of stochastic linear programming problem

Size: 5103x14529
Nonzeros: 29715

Kind: Linear Programming Problem
Author: N/A
Date: 2004
Link: https://sparse.tamu.edu/Meszaros/deter5
Sparse Matrix of size 5103x14529 by N/A.
January 6, 2026 at 6:01 PM
sparsematrix.bsky.social
CAG matrix set from Michael Monagan, Simon Fraser Univ., Canada

Size: 1916x1916
Nonzeros: 195985

Kind: Combinatorial Problem
Author: M. Monagan
Date: 2008
Link: https://sparse.tamu.edu/JGD_CAG/CAG_mat1916
Sparse Matrix of size 1916x1916 by M. Monagan.
January 6, 2026 at 12:01 PM
sparsematrix.bsky.social
Ill-conditioned matrix from a Stokes problem, by Dominick Szczerba

Size: 20896x20896
Nonzeros: 191368

Kind: Computational Fluid Dynamics Problem
Author: D. Szczerba
Date: 2007
Link: https://sparse.tamu.edu/Szczerba/Ill_Stokes
Sparse Matrix of size 20896x20896 by D. Szczerba.
January 6, 2026 at 6:01 AM
sparsematrix.bsky.social
Real-space pseudopotential method. Zhou, Saad, Tiago, Chelikowsky, Univ MN

Size: 221119x221119
Nonzeros: 7666057

Kind: Theoretical/Quantum Chemistry Problem
Author: Y. Zhou, Y. Saad, M. Tiago, J. Chelikowsky
Date: 2005
Link: https://sparse.tamu.edu/PARSEC/CO
Sparse Matrix of size 221119x221119 by Y. Zhou, Y. Saad, M. Tiago, J. Chelikowsky.
January 6, 2026 at 12:03 AM
sparsematrix.bsky.social
bodyy4, with coordinates. From NASA, collected by Alex Pothen

Size: 17546x17546
Nonzeros: 121550

Kind: Structural Problem
Author: NASA
Date: 2003
Link: https://sparse.tamu.edu/Pothen/bodyy4
Sparse Matrix of size 17546x17546 by NASA.
January 5, 2026 at 6:00 PM
sparsematrix.bsky.social
Jacobian from CEPII's 'G7marmotte' OLG model, oldstack 160

Size: 47430x47430
Nonzeros: 564952

Kind: Economic Problem
Author: P. Hollinger
Date: 2001
Link: https://sparse.tamu.edu/Hollinger/g7jac160
Sparse Matrix of size 47430x47430 by P. Hollinger.
January 5, 2026 at 12:00 PM
sparsematrix.bsky.social
Light hydrocarbon recovery. OK if illconditioned,from a nonlinear solvr

Size: 7337x7337
Nonzeros: 154660

Kind: Chemical Process Simulation Problem
Author: J. Mallya
Date: 1994
Link: https://sparse.tamu.edu/Mallya/lhr07
Sparse Matrix of size 7337x7337 by J. Mallya.
January 5, 2026 at 6:01 AM
sparsematrix.bsky.social
Simplicial complexes from Homology from Volkmar Welker.

Size: 17325x6930
Nonzeros: 69300

Kind: Combinatorial Problem
Author: V. Welker
Date: 2008
Link: https://sparse.tamu.edu/JGD_Homology/mk11-b3
Sparse Matrix of size 17325x6930 by V. Welker.
January 5, 2026 at 12:04 AM
sparsematrix.bsky.social
SYMMETRIC MATRIX FROM ALAN GEORGE'S L-SHAPE PROBLEMS, 1978.

Size: 1882x1882
Nonzeros: 12904

Kind: Thermal Problem
Author: A. George
Date: 1978
Link: https://sparse.tamu.edu/HB/lshp1882
Sparse Matrix of size 1882x1882 by A. George.
January 4, 2026 at 6:00 PM
sparsematrix.bsky.social
SYMMETRIC STIFFNESS MATRIX, SMALL OIL RIG, STATICALLY CONDENSED

Size: 66x66
Nonzeros: 4356

Kind: Structural Problem
Author: J. Lewis
Date: 1982
Link: https://sparse.tamu.edu/HB/bcsstk02
Sparse Matrix of size 66x66 by J. Lewis.
January 4, 2026 at 12:00 PM
sparsematrix.bsky.social
Pajek network: Ragusa set

Size: 24x24
Nonzeros: 81

Kind: Directed Weighted Graph
Author: V. Batagelj
Date: 2006
Link: https://sparse.tamu.edu/Pajek/Ragusa16
Sparse Matrix of size 24x24 by V. Batagelj.
January 4, 2026 at 6:00 AM
sparsematrix.bsky.social
SYMMETRIC PATTERN FROM ALAN GEORGE - GRADED L

Size: 1009x1009
Nonzeros: 6865

Kind: 2D/3D Problem
Author: A. George
Date: 1978
Link: https://sparse.tamu.edu/HB/jagmesh2
Sparse Matrix of size 1009x1009 by A. George.
January 4, 2026 at 12:05 AM
sparsematrix.bsky.social
REACTION-DIFFUSION BRUSSELATOR MODEL

Size: 800x800
Nonzeros: 4640

Kind: Computational Fluid Dynamics Problem
Author: K. Meerbergen
Date: 1994
Link: https://sparse.tamu.edu/Bai/rdb800l
Sparse Matrix of size 800x800 by K. Meerbergen.
January 3, 2026 at 6:00 PM
sparsematrix.bsky.social
Problematic linear programming problem, Meszaros test set

Size: 936x1908
Nonzeros: 5082

Kind: Linear Programming Problem
Author: N/A
Date: 2004
Link: https://sparse.tamu.edu/Meszaros/de080285
Sparse Matrix of size 936x1908 by N/A.
January 3, 2026 at 12:00 PM
sparsematrix.bsky.social
REACTION-DIFFUSION BRUSSELATOR MODEL

Size: 3200x3200
Nonzeros: 18880

Kind: Computational Fluid Dynamics Problem
Author: K. Meerbergen
Date: 1994
Link: https://sparse.tamu.edu/Bai/rdb3200l
Sparse Matrix of size 3200x3200 by K. Meerbergen.
January 3, 2026 at 6:00 AM
sparsematrix.bsky.social
UNSYMMETRIC PATTERN OF CURTIS, 1971

Size: 54x54
Nonzeros: 291

Kind: 2D/3D Problem
Author: A. Curtis
Date: 1971
Link: https://sparse.tamu.edu/HB/curtis54
Sparse Matrix of size 54x54 by A. Curtis.
January 3, 2026 at 12:03 AM
sparsematrix.bsky.social
AutoForm Eng, Zurich. pos. def. sheet metal forming

Size: 503625x503625
Nonzeros: 17550675

Kind: Structural Problem
Author: AutoForm Eng.
Date: 2006
Link: https://sparse.tamu.edu/Schenk_AFE/af_2_k101
Sparse Matrix of size 503625x503625 by AutoForm Eng..
January 2, 2026 at 6:00 PM
sparsematrix.bsky.social
Deterministic equiv. of stochastic linear programming problem

Size: 41340x85575
Nonzeros: 392252

Kind: Linear Programming Problem
Author: N/A
Date: 2004
Link: https://sparse.tamu.edu/Meszaros/fxm3_16
Sparse Matrix of size 41340x85575 by N/A.
January 2, 2026 at 12:00 PM
sparsematrix.bsky.social
Netlib LP problem lotfi: minimize c'*x, where Ax=b, lo<=x<=hi

Size: 153x366
Nonzeros: 1136

Kind: Linear Programming Problem
Author: V. Lofti
Date: 1989
Link: https://sparse.tamu.edu/LPnetlib/lp_lotfi
Sparse Matrix of size 153x366 by V. Lofti.
January 2, 2026 at 6:01 AM
sparsematrix.bsky.social
Large basis matrix from Q. Li, Univ. Wisconsin

Size: 440020x440020
Nonzeros: 5240084

Kind: Optimization Problem
Author: Q. Li
Date: 2008
Link: https://sparse.tamu.edu/QLi/largebasis
Sparse Matrix of size 440020x440020 by Q. Li.
January 2, 2026 at 12:03 AM
sparsematrix.bsky.social
Simplicial complexes from Homology from Volkmar Welker.

Size: 62370x51975
Nonzeros: 311850

Kind: Combinatorial Problem
Author: V. Welker
Date: 2008
Link: https://sparse.tamu.edu/JGD_Homology/mk12-b4
Sparse Matrix of size 62370x51975 by V. Welker.
January 1, 2026 at 6:01 PM
sparsematrix.bsky.social
UNSYMMETRIC BASIS FROM LP PROBLEM STAIR

Size: 363x363
Nonzeros: 2454

Kind: Optimization Problem Sequence
Author: M. Saunders
Date: 1978
Link: https://sparse.tamu.edu/HB/str_0
Sparse Matrix of size 363x363 by M. Saunders.
January 1, 2026 at 12:00 PM
sparsematrix.bsky.social
MANTEUFFEL'S FINITE ELEMENT PROBLEM (CONDENSED)

Size: 5976x5976
Nonzeros: 225046

Kind: Structural Problem
Author: T. Manteuffel
Date: 1980
Link: https://sparse.tamu.edu/HB/man_5976
Sparse Matrix of size 5976x5976 by T. Manteuffel.
January 1, 2026 at 6:03 AM
sparsematrix.bsky.social
SPLATZMAN SYMMETRIC FINITE DIFFERENCE THREE OCEAN MODEL

Size: 1919x1919
Nonzeros: 32399

Kind: 2D/3D Problem
Author: J. Lewis
Date: 1975
Link: https://sparse.tamu.edu/HB/plat1919
Sparse Matrix of size 1919x1919 by J. Lewis.
January 1, 2026 at 12:07 AM