Castrillon/denormal
denormals in A+alpha*I as alpha > 0 varies, J. Castrillon, Teledyne
| Name |
denormal |
| Group |
Castrillon |
| Matrix ID |
1892 |
|
Num Rows
|
89,400 |
|
Num Cols
|
89,400 |
|
Nonzeros
|
1,156,224 |
|
Pattern Entries
|
1,156,224 |
|
Kind
|
Counter Example Problem |
|
Symmetric
|
Yes |
|
Date
|
2008 |
|
Author
|
J. Castrillon |
|
Editor
|
T. Davis |
| Structural Rank |
89,400 |
| 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
|
yes |
|
Type
|
real |
| Download |
MATLAB
Rutherford Boeing
Matrix Market
|
| Notes |
The problem is x=(A+alpha*I)\b as alpha varies from 0 to 100. However,
as this occurs, performance suffers because of the many denormals that
appear below the diagonal in L.
|
