Matrix: HB/gre_343
Description: UNSYMMETRIC MATRIX FROM GRENOBLE,FRANCOIS CACHARD,MARCH 1981.
(bipartite graph drawing) | (graph drawing of A+A') |
Matrix properties | |
number of rows | 343 |
number of columns | 343 |
nonzeros | 1,310 |
# strongly connected comp. | 1 |
explicit zero entries | 125 |
nonzero pattern symmetry | 0% |
numeric value symmetry | 0% |
type | real |
structure | unsymmetric |
Cholesky candidate? | no |
positive definite? | no |
author | F. Cachard |
editor | I. Duff, R. Grimes, J. Lewis |
date | 1981 |
kind | directed weighted graph |
2D/3D problem? | no |
Note that all matrix statistics (except nonzero pattern symmetry) exclude the 125 explicit zero entries.
SVD-based statistics: | |
norm(A) | 1.00954 |
min(svd(A)) | 0.00901565 |
cond(A) | 111.976 |
rank(A) | 343 |
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.