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
1295 bloweya GHS_indef 30,004 30,004 150,009 Materials Problem 1992 MATLAB Rutherford Boeing Matrix Market
1216 aug2dc GHS_indef 30,200 30,200 80,000 2D/3D Problem 1994 MATLAB Rutherford Boeing Matrix Market
1237 helm3d01 GHS_indef 32,226 32,226 428,444 2D/3D Problem 2004 MATLAB Rutherford Boeing Matrix Market
1220 c-55 GHS_indef 32,780 32,780 403,450 Optimization Problem 2004 MATLAB Rutherford Boeing Matrix Market
1218 aug3dcqp GHS_indef 35,543 35,543 128,115 2D/3D Problem 1994 MATLAB Rutherford Boeing Matrix Market
1221 c-58 GHS_indef 37,595 37,595 552,551 Optimization 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
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
1224 c-63 GHS_indef 44,234 44,234 434,704 Optimization 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
1308 sparsine GHS_indef 50,000 50,000 1,548,988 Structural Problem 1995 MATLAB Rutherford Boeing Matrix Market
1304 ncvxbqp1 GHS_indef 50,000 50,000 349,968 Optimization Problem 1995 MATLAB Rutherford Boeing Matrix Market
1233 dawson5 GHS_indef 51,537 51,537 1,010,777 Structural Problem 2004 MATLAB Rutherford Boeing Matrix Market
1230 copter2 GHS_indef 55,476 55,476 759,952 Computational Fluid Dynamics Problem 2004 MATLAB Rutherford Boeing Matrix Market
1302 dixmaanl GHS_indef 60,000 60,000 299,998 Optimization Problem 1989 MATLAB Rutherford Boeing Matrix Market
1293 a5esindl GHS_indef 60,008 60,008 255,004 Optimization Problem 2004 MATLAB Rutherford Boeing Matrix Market
1294 blockqp1 GHS_indef 60,012 60,012 640,033 Optimization Problem 1994 MATLAB Rutherford Boeing Matrix Market
1306 ncvxqp5 GHS_indef 62,500 62,500 424,966 Optimization Problem 1995 MATLAB Rutherford Boeing Matrix Market
1225 c-68 GHS_indef 64,810 64,810 565,996 Optimization Problem 2004 MATLAB Rutherford Boeing Matrix Market