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).