HB/young3c
real matrix from aero research, David Young, corrected RUA version
| Name |
young3c |
| Group |
HB |
| Matrix ID |
280 |
|
Num Rows
|
841 |
|
Num Cols
|
841 |
|
Nonzeros
|
3,988 |
|
Pattern Entries
|
3,988 |
|
Kind
|
Acoustics Problem |
|
Symmetric
|
No |
|
Date
|
1984 |
|
Author
|
D. Young |
|
Editor
|
I. Duff, R. Grimes, J. Lewis |
| Structural Rank |
841 |
| Structural Rank Full |
true |
|
Num Dmperm Blocks
|
1 |
|
Strongly Connect Components
|
1 |
|
Num Explicit Zeros
|
0 |
|
Pattern Symmetry
|
93.8% |
|
Numeric Symmetry
|
80.7% |
|
Cholesky Candidate
|
no |
|
Positive Definite
|
no |
|
Type
|
real |
| SVD Statistics |
| Matrix Norm |
4.618277e+02 |
| Minimum Singular Value |
4.966799e-02 |
| Condition Number |
9.298297e+03
|
| Rank |
841 |
| sprank(A)-rank(A) |
0 |
| Null Space Dimension |
0 |
| Full Numerical Rank? |
yes |
| Download Singular Values |
MATLAB
|
| Download |
MATLAB
Rutherford Boeing
Matrix Market
|
| Notes |
The YOUNG*C matrices originally appeared in the Harwell/Boeing
collection as type CSA (complex symmetric). However, both upper
and lower triangular parts are present in the original files
(an invalid specification; only the lower part can be present
in the file). If the entries in the upper triangular part are
considered as part of the matrix, the matrices become unsymmetric.
The matrices have been corrected in the UF Sparse Matrix Collection
by changing their type to CUA so that the entries in the original
files are not ignored. In addition, the YOUNG3C matrix has a zero
imaginary part, and thus appears here as a real matrix.
|
