Matrix: Pothen/mesh1em1
Description: mesh1em1, with coordinates. From NASA, collected by Alex Pothen
(undirected graph drawing) |
Matrix properties | |
number of rows | 48 |
number of columns | 48 |
nonzeros | 306 |
structural full rank? | yes |
structural rank | 48 |
# of blocks from dmperm | 1 |
# strongly connected comp. | 1 |
explicit zero entries | 0 |
nonzero pattern symmetry | symmetric |
numeric value symmetry | symmetric |
type | real |
structure | symmetric |
Cholesky candidate? | yes |
positive definite? | yes |
author | NASA |
editor | G. Kumfert, A. Pothen |
date | 2003 |
kind | structural problem |
2D/3D problem? | yes |
Additional fields | size and type |
coord | full 48-by-2 |
Ordering statistics: | result |
nnz(chol(P*(A+A'+s*I)*P')) with AMD | 336 |
Cholesky flop count | 2.7e+03 |
nnz(L+U), no partial pivoting, with AMD | 624 |
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD | 432 |
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD | 769 |
SVD-based statistics: | |
norm(A) | 29.6962 |
min(svd(A)) | 1.56312 |
cond(A) | 18.998 |
rank(A) | 48 |
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.