UF Sparse Matrix Collection: GHS_psdef group.

matrix	graph	Group/Name	id	download	# rows	# cols	nonzeros	type	sym	spd?
		GHS_psdef/apache1	1422	MAT, MM, RB	80,800	80,800	542,184	real symmetric	yes	yes
		GHS_psdef/apache2	1423	MAT, MM, RB	715,176	715,176	4,817,870	real symmetric	yes	yes
		GHS_psdef/audikw_1	1252	MAT, MM, RB	943,695	943,695	77,651,847	real symmetric	yes	yes
		GHS_psdef/bmw7st_1	1253	MAT, MM, RB	141,347	141,347	7,318,399	real symmetric	yes	yes
		GHS_psdef/bmwcra_1	1254	MAT, MM, RB	148,770	148,770	10,641,602	real symmetric	yes	yes
		GHS_psdef/copter1	1255	MAT, MM, RB	17,222	17,222	211,064	binary symmetric	yes	no
		GHS_psdef/copter2	1256	MAT, MM, RB	55,476	55,476	759,952	binary symmetric	yes	no
		GHS_psdef/crankseg_1	1257	MAT, MM, RB	52,804	52,804	10,614,210	real symmetric	yes	yes
		GHS_psdef/crankseg_2	1258	MAT, MM, RB	63,838	63,838	14,148,858	real symmetric	yes	yes
		GHS_psdef/cvxbqp1	1310	MAT, MM, RB	50,000	50,000	349,968	real symmetric	yes	yes
		GHS_psdef/finance256	1261	MAT, MM, RB	37,376	37,376	298,496	binary symmetric	yes	no
		GHS_psdef/ford1	1262	MAT, MM, RB	18,728	18,728	101,576	binary symmetric	yes	no
		GHS_psdef/ford2	1263	MAT, MM, RB	100,196	100,196	544,688	binary symmetric	yes	no
		GHS_psdef/gridgena	1311	MAT, MM, RB	48,962	48,962	512,084	real symmetric	yes	yes
		GHS_psdef/hood	1266	MAT, MM, RB	220,542	220,542	9,895,422	real symmetric	yes	yes
		GHS_psdef/inline_1	1267	MAT, MM, RB	503,712	503,712	36,816,170	real symmetric	yes	yes
		GHS_psdef/jnlbrng1	1312	MAT, MM, RB	40,000	40,000	199,200	real symmetric	yes	yes
		GHS_psdef/ldoor	1268	MAT, MM, RB	952,203	952,203	42,493,817	real symmetric	yes	yes
		GHS_psdef/minsurfo	1313	MAT, MM, RB	40,806	40,806	203,622	real symmetric	yes	yes
		GHS_psdef/obstclae	1314	MAT, MM, RB	40,000	40,000	197,608	real symmetric	yes	yes
		GHS_psdef/oilpan	1270	MAT, MM, RB	73,752	73,752	2,148,558	real symmetric	yes	yes
		GHS_psdef/opt1	1271	MAT, MM, RB	15,449	15,449	1,930,655	binary symmetric	yes	no
		GHS_psdef/pds10	1272	MAT, MM, RB	16,558	16,558	149,658	binary symmetric	yes	no
		GHS_psdef/pwt	1273	MAT, MM, RB	36,519	36,519	326,107	binary symmetric	yes	no
		GHS_psdef/ramage02	1274	MAT, MM, RB	16,830	16,830	2,866,352	binary symmetric	yes	no
		GHS_psdef/s3dkq4m2	1275	MAT, MM, RB	90,449	90,449	4,427,725	real symmetric	yes	yes
		GHS_psdef/s3dkt3m2	1276	MAT, MM, RB	90,449	90,449	3,686,223	real symmetric	yes	yes
		GHS_psdef/srb1	1282	MAT, MM, RB	54,924	54,924	2,962,152	binary symmetric	yes	no
		GHS_psdef/torsion1	1315	MAT, MM, RB	40,000	40,000	197,608	real symmetric	yes	yes
		GHS_psdef/vanbody	1287	MAT, MM, RB	47,072	47,072	2,329,056	real symmetric	yes	yes
		GHS_psdef/wathen100	1288	MAT, MM, RB	30,401	30,401	471,601	real symmetric	yes	yes
		GHS_psdef/wathen120	1289	MAT, MM, RB	36,441	36,441	565,761	real symmetric	yes	yes

Maintained by Tim Davis, last updated 10-Jun-2015.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
See UFget to download directly into MATLAB.