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).
|