Group GHS_indef

Group Description 
Indefinite matrices collected by Nick Gould, Yifan Hu, and Jennifer Scott.

The GHS_indef and GHS_psdef collection includes matrices from the Matrix
Market (math.nist.gov/MatrixMarket), Rutherford-Boeing collection (Duff,
Grimes, and Lewis), the Parasol project (see below), Kumfert and Pothen,
CUTE/CUTEr optimization test set, the UF sparse matrix collection
(those are excluded here), Andy Wathen, Mario Arioli, Christian Damhaug,
Alison Ramage, Anshul Gupta (Gupta's matrices are in the UF collection
under the Gupta directory), Olaf Schenk (matrices from Olaf Schenk are
located here, as well as in the existing Schenk_* directories),
Miroslav Tuma, Maros and Meszaros, and the Dept. of Mathematical
Modelling in DIAMO (Czech Republic).

See ftp://ftp.numerical.rl.ac.uk/pub/matrices/symmetric/ for the
GHS collection.

NOTE: matrices can have upper-case or lower case matrix-type fields
(rsa or RSA, for example).

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bms3_2 matrix:
Source:   www.parallab.uib.no/parasol/data.html  (matrix BMW3_2)
Linear static analysis of a car body. Indefinite matrix.
              (MSC-CARBODY-220K)
Order         227362    
No. entries  5757996                          

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Matrices form Olaf Schenk:  see the description in the Schenk_IBMNA
directory, for the c-55 to c-72 matrices.

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SIT100, K1_SAN, OLESNIKO, D_PRETOK, and TURON_M are from the Dept. of
Mathematical Modelling in DIAMO, s.e., Straz pod Ralskem, Czech Republic.
They represent fluid flow in porous media.
Displaying collection matrices 21 - 40 of 60 in total
Id Name Group Rows Cols Nonzeros Kind Date Download File
1235 exdata_1 GHS_indef 6,001 6,001 2,269,500 Optimization Problem 2004 MATLAB Rutherford Boeing Matrix Market
1236 helm2d03 GHS_indef 392,257 392,257 2,741,935 2D/3D Problem 2004 MATLAB Rutherford Boeing Matrix Market
1237 helm3d01 GHS_indef 32,226 32,226 428,444 2D/3D Problem 2004 MATLAB Rutherford Boeing Matrix Market
1238 k1_san GHS_indef 67,759 67,759 559,774 2D/3D Problem 2004 MATLAB Rutherford Boeing Matrix Market
1239 laser GHS_indef 3,002 3,002 9,000 Materials Problem 2004 MATLAB Rutherford Boeing Matrix Market
1240 mario001 GHS_indef 38,434 38,434 204,912 2D/3D Problem 2004 MATLAB Rutherford Boeing Matrix Market
1241 mario002 GHS_indef 389,874 389,874 2,097,566 Duplicate 2D/3D Problem 2004 MATLAB Rutherford Boeing Matrix Market
1242 ncvxqp1 GHS_indef 12,111 12,111 73,963 Optimization Problem 1994 MATLAB Rutherford Boeing Matrix Market
1243 ncvxqp9 GHS_indef 16,554 16,554 54,040 Optimization Problem 1994 MATLAB Rutherford Boeing Matrix Market
1244 olesnik0 GHS_indef 88,263 88,263 744,216 2D/3D Problem 2004 MATLAB Rutherford Boeing Matrix Market
1245 sit100 GHS_indef 10,262 10,262 61,046 2D/3D Problem 2004 MATLAB Rutherford Boeing Matrix Market
1246 stokes128 GHS_indef 49,666 49,666 558,594 Computational Fluid Dynamics Problem 2004 MATLAB Rutherford Boeing Matrix Market
1247 stokes64 GHS_indef 12,546 12,546 140,034 Computational Fluid Dynamics Problem 2004 MATLAB Rutherford Boeing Matrix Market
1248 stokes64s GHS_indef 12,546 12,546 140,034 Computational Fluid Dynamics Problem 2004 MATLAB Rutherford Boeing Matrix Market
1249 tuma1 GHS_indef 22,967 22,967 87,760 2D/3D Problem 2004 MATLAB Rutherford Boeing Matrix Market
1250 tuma2 GHS_indef 12,992 12,992 49,365 2D/3D Problem 2004 MATLAB Rutherford Boeing Matrix Market
1251 turon_m GHS_indef 189,924 189,924 1,690,876 2D/3D Problem 2004 MATLAB Rutherford Boeing Matrix Market
1291 a0nsdsil GHS_indef 80,016 80,016 355,034 Optimization Problem 2004 MATLAB Rutherford Boeing Matrix Market
1292 a2nnsnsl GHS_indef 80,016 80,016 347,222 Optimization Problem 2004 MATLAB Rutherford Boeing Matrix Market
1293 a5esindl GHS_indef 60,008 60,008 255,004 Optimization Problem 2004 MATLAB Rutherford Boeing Matrix Market