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.
