Boeing/nasa1824
STRUCTURE FROM NASA LANGLEY, 1824 DEGREES OF FREEDOM
| Name |
nasa1824 |
| Group |
Boeing |
| Matrix ID |
363 |
|
Num Rows
|
1,824 |
|
Num Cols
|
1,824 |
|
Nonzeros
|
39,208 |
|
Pattern Entries
|
39,208 |
|
Kind
|
Duplicate Structural Problem |
|
Symmetric
|
Yes |
|
Date
|
1995 |
|
Author
|
R. Grimes |
|
Editor
|
T. Davis |
| Structural Rank |
1,824 |
| Structural Rank Full |
true |
|
Num Dmperm Blocks
|
1 |
|
Strongly Connect Components
|
1 |
|
Num Explicit Zeros
|
0 |
|
Pattern Symmetry
|
100% |
|
Numeric Symmetry
|
100% |
|
Cholesky Candidate
|
yes |
|
Positive Definite
|
no |
|
Type
|
real |
| SVD Statistics |
| Matrix Norm |
2.121717e+07 |
| Minimum Singular Value |
3.601133e+00 |
| Condition Number |
5.891804e+06
|
| Rank |
1,824 |
| sprank(A)-rank(A) |
0 |
| Null Space Dimension |
0 |
| Full Numerical Rank? |
yes |
| Download Singular Values |
MATLAB
|
| Download |
MATLAB
Rutherford Boeing
Matrix Market
|
| Notes |
Let A1=Nasa/nasa1824 and A2=Boeing/nasa1824. A1 and A2 have the same
nonzero pattern. A1 and A2 differ in value in only 386 entries out of
39208, and only in 21 columns of the lower triangular part;
tril(A(196:321,196:216)) and the same rows of the upper triangular
part. The magnitudes of the entries in A2 in this region of the
matrix are all tiny, and have only 9 digits if printed in base-10
(unlike the other entries, which have full precision). I suspect A2
(Boeing/nasa1824) is a corrupted version of A1 (Nasa/nasa1824).
|
