Matrix: Bydder/mri1
Description: MRI reconstruction (1), from Mark Bydder, UCSD
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| (bipartite graph drawing) |
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 |
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| Matrix properties | |
| number of rows | 65,536 |
| number of columns | 147,456 |
| nonzeros | 589,824 |
| structural full rank? | no |
| structural rank | 64,517 |
| # of blocks from dmperm | 258 |
| # strongly connected comp. | 32,820 |
| explicit zero entries | 0 |
| nonzero pattern symmetry | 0% |
| numeric value symmetry | 0% |
| type | real |
| structure | rectangular |
| Cholesky candidate? | no |
| positive definite? | no |
| author | M. Bydder |
| editor | T. Davis |
| date | 2005 |
| kind | computer graphics/vision problem |
| 2D/3D problem? | yes |
| Additional fields | size and type |
| b | full 65536-by-1 |
Notes:
x = lsqr (A,b) ; imagesc (abs (fftshift (fft2 (reshape (x, 384, 384))))) ;
| Ordering statistics: | result |
| nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD | 90,338,640 |
| nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD | 7,148,111 |
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.