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Sparse Matrix
@sparsematrix.bsky.social
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sparsematrix.bsky.social
DIMACS10 set: random/rgg_n_2_19_s0

Size: 524288x524288
Nonzeros: 6539532

Kind: Undirected Random Graph
Author: M. Holtgrewe, P. Sanders, C. Schulz
Date: 2011
Link: https://sparse.tamu.edu/DIMACS10/rgg_n_2_19_s0
Sparse Matrix of size 524288x524288 by M. Holtgrewe, P. Sanders, C. Schulz.
November 12, 2025 at 12:02 AM
sparsematrix.bsky.social
SYMMETRIC MATRIX FROM ALAN GEORGE'S L-SHAPE PROBLEMS, 1978.

Size: 3466x3466
Nonzeros: 23896

Kind: Thermal Problem
Author: A. George
Date: 1978
Link: https://sparse.tamu.edu/HB/lshp3466
Sparse Matrix of size 3466x3466 by A. George.
November 11, 2025 at 6:00 PM
sparsematrix.bsky.social
Random matrix, 1% uniformly distributed.

Size: 1000x1000
Nonzeros: 19980

Kind: Undirected Random Graph
Author: C. Helmberg
Date: 1996
Link: https://sparse.tamu.edu/Gset/G46
Sparse Matrix of size 1000x1000 by C. Helmberg.
November 11, 2025 at 12:01 PM
sparsematrix.bsky.social
Netlib LP problem greenbeb: minimize c'*x, where Ax=b, lo<=x<=hi

Size: 2392x5598
Nonzeros: 31070

Kind: Linear Programming Problem
Author: K. Palmer
Date: 1984
Link: https://sparse.tamu.edu/LPnetlib/lp_greenbeb
Sparse Matrix of size 2392x5598 by K. Palmer.
November 11, 2025 at 6:00 AM
sparsematrix.bsky.social
Symmetric indefinite KKT matrix, O. Schenk, Univ. of Basel

Size: 8345600x8345600
Nonzeros: 225422112

Kind: Optimization Problem
Author: O. Schenk, A. Waechter, M. Weiser
Date: 2008
Link: https://sparse.tamu.edu/Schenk/nlpkkt160
Sparse Matrix of size 8345600x8345600 by O. Schenk, A. Waechter, M. Weiser.
November 11, 2025 at 12:02 AM
sparsematrix.bsky.social
The MathWorks, Inc: symmetric positive definite matrix

Size: 7102x7102
Nonzeros: 340200

Kind: Structural Problem
Author: B. Cheng
Date: 2006
Link: https://sparse.tamu.edu/MathWorks/Kuu
Sparse Matrix of size 7102x7102 by B. Cheng.
November 10, 2025 at 6:00 PM
sparsematrix.bsky.social
orbitRaising optimal control problem (matrix 4 of 4)

Size: 915x915
Nonzeros: 7790

Kind: Optimal Control Problem
Author: B. Senses, A. Rao
Date: 2015
Link: https://sparse.tamu.edu/VDOL/orbitRaising_4
Sparse Matrix of size 915x915 by B. Senses, A. Rao.
November 10, 2025 at 12:00 PM
sparsematrix.bsky.social
FEM problem, temperature and deformation of a steel cylinder

Size: 102158x102158
Nonzeros: 711558

Kind: Thermal Problem
Author: I. Botonakis
Date: 2009
Link: https://sparse.tamu.edu/Botonakis/thermomech_TK
Sparse Matrix of size 102158x102158 by I. Botonakis.
November 10, 2025 at 6:00 AM
sparsematrix.bsky.social
PKU SYMMETRIC STIFFNESS, GROUP SILOS IN DALIAN, CHINA

Size: 33960x33960
Nonzeros: 1583640

Kind: Structural Problem
Author: P. Chen
Date: 2002
Link: https://sparse.tamu.edu/Chen/pkustk09
Sparse Matrix of size 33960x33960 by P. Chen.
November 10, 2025 at 12:02 AM
sparsematrix.bsky.social
Symmetric indefinite KKT matrix, O. Schenk, Univ. of Basel

Size: 16240000x16240000
Nonzeros: 440225632

Kind: Optimization Problem
Author: O. Schenk, A. Waechter, M. Weiser
Date: 2008
Link: https://sparse.tamu.edu/Schenk/nlpkkt200
Sparse Matrix of size 16240000x16240000 by O. Schenk, A. Waechter, M. Weiser.
November 9, 2025 at 6:00 PM
sparsematrix.bsky.social
SYMMETRIC CONNECTION TABLE FROM DTNSRDC, WASHINGTON

Size: 512x512
Nonzeros: 3502

Kind: Structural Problem
Author: G. Everstine, D. Taylor
Date: 1980
Link: https://sparse.tamu.edu/HB/dwt_512
Sparse Matrix of size 512x512 by G. Everstine, D. Taylor.
November 9, 2025 at 12:00 PM
sparsematrix.bsky.social
spaceStation optimal control problem (matrix 13 of 14)

Size: 1617x1617
Nonzeros: 23649

Kind: Optimal Control Problem
Author: B. Senses, A. Rao
Date: 2015
Link: https://sparse.tamu.edu/VDOL/spaceStation_13
Sparse Matrix of size 1617x1617 by B. Senses, A. Rao.
November 9, 2025 at 6:00 AM
sparsematrix.bsky.social
Deterministic equiv. of stochastic linear programming problem

Size: 7647x21777
Nonzeros: 44547

Kind: Linear Programming Problem
Author: N/A
Date: 2004
Link: https://sparse.tamu.edu/Meszaros/deter3
Sparse Matrix of size 7647x21777 by N/A.
November 9, 2025 at 12:04 AM
sparsematrix.bsky.social
Symmetric powers of graphs from Gordon Royle, Univ Western Australia

Size: 560x560
Nonzeros: 8736

Kind: Combinatorial Problem
Author: G. Royle
Date: 2008
Link: https://sparse.tamu.edu/JGD_SPG/EX2
Sparse Matrix of size 560x560 by G. Royle.
November 8, 2025 at 6:00 PM
sparsematrix.bsky.social
2D 197-by-195 complex mesh. Wonsik Kim, Korea

Size: 38415x38415
Nonzeros: 933195

Kind: 2D/3D Problem
Author: W. Kim
Date: 2002
Link: https://sparse.tamu.edu/Kim/kim1
Sparse Matrix of size 38415x38415 by W. Kim.
November 8, 2025 at 12:00 PM
sparsematrix.bsky.social
3D structural problem

Size: 4147110x4147110
Nonzeros: 316548962

Kind: 2D/3D Problem
Author: C. Janna, M. Ferronato
Date: 2014
Link: https://sparse.tamu.edu/Janna/Queen_4147
Sparse Matrix of size 4147110x4147110 by C. Janna, M. Ferronato.
November 8, 2025 at 6:00 AM
sparsematrix.bsky.social
DIMACS10 set: redistrict/ct2010 and ct2010a

Size: 67578x67578
Nonzeros: 336352

Kind: Undirected Weighted Graph
Author: W. Zhao
Date: 2010
Link: https://sparse.tamu.edu/DIMACS10/ct2010
Sparse Matrix of size 67578x67578 by W. Zhao.
November 8, 2025 at 12:02 AM
sparsematrix.bsky.social
barth, with coordinates. From NASA, collected by Alex Pothen

Size: 6691x6691
Nonzeros: 46187

Kind: Structural Problem
Author: NASA
Date: 2003
Link: https://sparse.tamu.edu/Pothen/barth
Sparse Matrix of size 6691x6691 by NASA.
November 7, 2025 at 6:00 PM
sparsematrix.bsky.social
skirt, with coordinates. From NASA, collected by Alex Pothen

Size: 12598x12598
Nonzeros: 196520

Kind: Structural Problem
Author: NASA
Date: 2003
Link: https://sparse.tamu.edu/Pothen/skirt
Sparse Matrix of size 12598x12598 by NASA.
November 7, 2025 at 12:00 PM
sparsematrix.bsky.social
TEST MATRIX FROM FIDAP: EX1.MAT

Size: 216x216
Nonzeros: 4317

Kind: Computational Fluid Dynamics Problem
Author: A. Baggag, Y. Saad
Date: 1994
Link: https://sparse.tamu.edu/FIDAP/ex1
Sparse Matrix of size 216x216 by A. Baggag, Y. Saad.
November 7, 2025 at 6:00 AM
sparsematrix.bsky.social
FEM problem, temperature and deformation of a steel cylinder

Size: 102158x102158
Nonzeros: 711558

Kind: Thermal Problem
Author: I. Botonakis
Date: 2009
Link: https://sparse.tamu.edu/Botonakis/thermomech_TC
Sparse Matrix of size 102158x102158 by I. Botonakis.
November 7, 2025 at 12:03 AM
sparsematrix.bsky.social
DIMACS10 set: clustering/preferentialAttachment

Size: 100000x100000
Nonzeros: 999970

Kind: Random Undirected Graph
Author: H. Meyerhenke
Date: 2011
Link: https://sparse.tamu.edu/DIMACS10/preferentialAttachment
Sparse Matrix of size 100000x100000 by H. Meyerhenke.
November 6, 2025 at 6:00 PM
sparsematrix.bsky.social
Mycielskian graph M9

Size: 383x383
Nonzeros: 14542

Kind: Undirected Graph
Author: J. Mycielski
Date: 2018
Link: https://sparse.tamu.edu/Mycielski/mycielskian9
Sparse Matrix of size 383x383 by J. Mycielski.
November 6, 2025 at 12:00 PM
sparsematrix.bsky.social
Brazilian Interconnect Power System (BIPS/97) (CEPEL, Brazil)

Size: 13309x13309
Nonzeros: 48872

Kind: Eigenvalue/Model Reduction Problem
Author: N. Martins
Date: 2010
Link: https://sparse.tamu.edu/Rommes/mimo8x8_system
Sparse Matrix of size 13309x13309 by N. Martins.
November 6, 2025 at 6:00 AM
sparsematrix.bsky.social
Schenk: IBM TJ Watson, Yorktown, nonlinear optimization

Size: 41282x41282
Nonzeros: 480536

Kind: Optimization Problem
Author: IBM
Date: 2004
Link: https://sparse.tamu.edu/GHS_indef/c-59
Sparse Matrix of size 41282x41282 by IBM.
November 6, 2025 at 12:02 AM