A collection of sparse matrices was begun by Curtis and Reid at Harwell in the early 1970's and was later extended by Duff into the present collection. These 36 matrices and matrix patterns come from a wide range of disciplines. A major objective of the test collection has been to represent important features of practical problems. Sparse matrix characteristics (such as average density of entries per row, pattern of the entries, symmetry, and matrix size) can differ among matrices arising from different disciplines. The test problems, though varying widely in their characteristics, have very distinctive patterns. For the symmetric matrices, we record only the entries on and below the diagonal.

Matrices in this set:

• LUND A (real symmetric indefinite, 147 by 147, 1298 entries), stiffness and mass
• LUND B (real symmetric indefinite, 147 by 147, 1294 entries), stiffness and mass
• ERIS1176 (pattern symmetric indefinite, 1176 by 1176, 9864 entries), electrical network
• GENT113 (pattern unsymmetric, 113 by 113, 655 entries), statistical application
• IBM32 (pattern unsymmetric, 32 by 32, 126 entries), 1971 IBM conference advertisement
• CURTIS54 (pattern unsymmetric, 54 by 54, 291 entries), stiff biochemical ordinary differential equations (ODEs)
• WILL57 (pattern unsymmetric, 57 by 57, 281 entries), Jacobian of emitter-follower-current switch circuit
• WILL199 (pattern unsymmetric, 199 by 199, 701 entries), stress-analysis
• ASH292 (pattern symmetric indefinite, 292 by 292, 1250 entries), United Kingdom survey
• ASH85 (pattern symmetric indefinite, 85 by 85, 304 entries), Holland survey
• ARC130 (real unsymmetric, 85 by 85, 304 entries), Laser problem
• SHL 0 (real unsymmetric, 663 by 663, 1687 entries), Simplex method basis matrix
• SHL 200 (real unsymmetric, 663 by 663, 1726 entries), Simplex method basis matrix
• SHL 400 (real unsymmetric, 663 by 663, 1712 entries), Simplex method basis matrix
• STR 0 (real unsymmetric, 363 by 363, 2454 entries), Simplex method basis matrix
• STR 200 (real unsymmetric, 363 by 363, 3068 entries), Simplex method basis matrix
• STR 400 (real unsymmetric, 363 by 363, 3157 entries), Simplex method basis matrix
• STR 600 (real unsymmetric, 363 by 363, 3279 entries), Simplex method basis matrix
• BP 0 (real unsymmetric, 822 by 822, 3276 entries), Simplex method basis matrix
• BP 200 (real unsymmetric, 822 by 822, 3802 entries), Simplex method basis matrix
• BP 400 (real unsymmetric, 822 by 822, 4028 entries), Simplex method basis matrix
• BP 600 (real unsymmetric, 822 by 822, 4172 entries), Simplex method basis matrix
• BP 800 (real unsymmetric, 822 by 822, 4534 entries), Simplex method basis matrix
• BP 1000 (real unsymmetric, 822 by 822, 4661 entries), Simplex method basis matrix
• BP 1200 (real unsymmetric, 822 by 822, 4726 entries), Simplex method basis matrix
• BP 1400 (real unsymmetric, 822 by 822, 4790 entries), Simplex method basis matrix
• BP 1600 (real unsymmetric, 822 by 822, 4841 entries), Simplex method basis matrix
• ASH219 (pattern unsymmetric, 219 by 85, 438 entries), Survey of Holland
• ASH958 (pattern unsymmetric, 958 by 292, 1916 entries), United Kingdom survey
• ASH331 (pattern unsymmetric, 331 by 104, 662 entries), Scotland survey
• ASH608 (pattern unsymmetric, 608 by 188, 1216 entries), England survey
• ABB313 (pattern unsymmetric, 313 by 176, 1557 entries), Survey of Sudan
• FS 541 1 (real unsymmetric, 541 by 541, 4285 entries), one stage of FACSIMILE stiff ordinary differential equation (ODE) package, for atmospheric pollution problem, involving chemical kinetics and two-dimensional transport
• FS 541 2 (real unsymmetric, 541 by 541, 4285 entries), one stage of FACSIMILE stiff ordinary differential equation (ODE) package, for atmospheric pollution problem, involving chemical kinetics and two-dimensional transport
• FS 541 3 (real unsymmetric, 541 by 541, 4285 entries), one stage of FACSIMILE stiff ordinary differential equation (ODE) package, for atmospheric pollution problem, involving chemical kinetics and two-dimensional transport
• FS 541 4 (real unsymmetric, 541 by 541, 4285 entries), one stage of FACSIMILE stiff ordinary differential equation (ODE) package, for atmospheric pollution problem, involving chemical kinetics and two-dimensional transport
  
  
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