Matrix: MathWorks/Pd_rhs
Description: Matrix problem X=A\B with many sparse right-hand-sides
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| Matrix properties | |
| number of rows | 8,081 |
| number of columns | 12,406 |
| nonzeros | 6,323 |
| structural full rank? | no |
| structural rank | 4,368 |
| # of blocks from dmperm | 2,872 |
| # strongly connected comp. | 14,549 |
| explicit zero entries | 0 |
| nonzero pattern symmetry | 0% |
| numeric value symmetry | 0% |
| type | real |
| structure | rectangular |
| Cholesky candidate? | no |
| positive definite? | no |
| author | P. Anderson |
| editor | T. Davis |
| date | 2002 |
| kind | counter-example problem |
| 2D/3D problem? | no |
| Ordering statistics: | result |
| nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD | 9,829 |
| nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD | 8,788 |
| SVD-based statistics: | |
| norm(A) | 135541 |
| min(svd(A)) | 0 |
| cond(A) | Inf |
| rank(A) | 4,368 |
| sprank(A)-rank(A) | 0 |
| null space dimension | 3,713 |
| full numerical rank? | no |
| singular value gap | 6.73494e+07 |
| singular values (MAT file): | click here |
| SVD method used: | s = svd (full (A)) ; |
| status: | ok |
For a description of the statistics displayed above, click here.
Maintained by Tim Davis, last updated 12-Mar-2014.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.