Matrix: HB/orani678
Description: UNSYMMETRIC MATRIX ORANI678 ST ERTAR 24OCT84
(bipartite graph drawing) | (graph drawing of A+A') |
Matrix properties | |
number of rows | 2,529 |
number of columns | 2,529 |
nonzeros | 90,158 |
structural full rank? | yes |
structural rank | 2,529 |
# of blocks from dmperm | 700 |
# strongly connected comp. | 1 |
explicit zero entries | 0 |
nonzero pattern symmetry | 7% |
numeric value symmetry | 0% |
type | real |
structure | unsymmetric |
Cholesky candidate? | no |
positive definite? | no |
author | K. Pearson |
editor | I. Duff, R. Grimes, J. Lewis |
date | 1984 |
kind | economic problem |
2D/3D problem? | no |
Additional fields | size and type |
b | sparse 2529-by-86 |
Ordering statistics: | result |
nnz(chol(P*(A+A'+s*I)*P')) with AMD | 331,374 |
Cholesky flop count | 1.4e+08 |
nnz(L+U), no partial pivoting, with AMD | 660,219 |
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD | 277,111 |
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD | 1,193,273 |
SVD-based statistics: | |
norm(A) | 31.9856 |
min(svd(A)) | 0.0033388 |
cond(A) | 9579.95 |
rank(A) | 2,529 |
sprank(A)-rank(A) | 0 |
null space dimension | 0 |
full numerical rank? | yes |
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.