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 1 - 20 of 60 in total
Id Name Group Rows Cols Nonzeros Kind Date Download File
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
1215 aug2d GHS_indef 29,008 29,008 76,832 2D/3D Problem 1994 MATLAB Rutherford Boeing Matrix Market
1216 aug2dc GHS_indef 30,200 30,200 80,000 2D/3D Problem 1994 MATLAB Rutherford Boeing Matrix Market
1217 aug3d GHS_indef 24,300 24,300 69,984 2D/3D Problem 1994 MATLAB Rutherford Boeing Matrix Market
1218 aug3dcqp GHS_indef 35,543 35,543 128,115 2D/3D Problem 1994 MATLAB Rutherford Boeing Matrix Market
1294 blockqp1 GHS_indef 60,012 60,012 640,033 Optimization Problem 1994 MATLAB Rutherford Boeing Matrix Market
1295 bloweya GHS_indef 30,004 30,004 150,009 Materials Problem 1992 MATLAB Rutherford Boeing Matrix Market
1424 bloweybl GHS_indef 30,003 30,003 109,999 Materials Problem 1992 MATLAB Rutherford Boeing Matrix Market
1425 bloweybq GHS_indef 10,001 10,001 49,999 Materials Problem 1992 MATLAB Rutherford Boeing Matrix Market
1219 bmw3_2 GHS_indef 227,362 227,362 11,288,630 Structural Problem 2004 MATLAB Rutherford Boeing Matrix Market
1296 boyd1 GHS_indef 93,279 93,279 1,211,231 Optimization Problem 2004 MATLAB Rutherford Boeing Matrix Market
1297 boyd2 GHS_indef 466,316 466,316 1,500,397 Optimization Problem 2004 MATLAB Rutherford Boeing Matrix Market
1298 brainpc2 GHS_indef 27,607 27,607 179,395 Optimization Problem 1994 MATLAB Rutherford Boeing Matrix Market
1299 bratu3d GHS_indef 27,792 27,792 173,796 2D/3D Problem 1989 MATLAB Rutherford Boeing Matrix Market
1220 c-55 GHS_indef 32,780 32,780 403,450 Optimization Problem 2004 MATLAB Rutherford Boeing Matrix Market
1221 c-58 GHS_indef 37,595 37,595 552,551 Optimization Problem 2004 MATLAB Rutherford Boeing Matrix Market
1222 c-59 GHS_indef 41,282 41,282 480,536 Optimization Problem 2004 MATLAB Rutherford Boeing Matrix Market
1223 c-62ghs GHS_indef 41,731 41,731 559,339 Subsequent Optimization 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