Precima/analytics
Precima/analytics: data analytics problem
Name 
analytics 
Group 
Precima 
Matrix ID 
2851 
Num Rows

303,813 
Num Cols

303,813 
Nonzeros

2,006,126 
Pattern Entries

2,006,126 
Kind

Data Analytics Problem 
Symmetric

Yes 
Date

2018 
Author

C. Ugaz 
Editor

T. Davis 
Structural Rank 
303,813 
Structural Rank Full 
true 
Num Dmperm Blocks

41,422 
Strongly Connect Components

41,422 
Num Explicit Zeros

0 
Pattern Symmetry

100% 
Numeric Symmetry

100% 
Cholesky Candidate

no 
Positive Definite

no 
Type

real 
Download 
MATLAB
Rutherford Boeing
Matrix Market

Notes 
Precima: data analytics problem
Submitted by Carl Ugaz, Precima, Inc. CUgaz@precima.com
The matrix is nonsingular, illconditioned,, and symmetric indefinite.
If factorized with KLU, best results are obtained if the permutation to
block triangular form (BTF) is not used, because it breaks the symmetry
of the pattern.
Ignoring the diagonal (which has some zero entries and some nonzero)
the undirected graph of A divides into 41,422 connected components.
Of those, 40,966 are single nodes, and 451 components have between
4 and 90 nodes. The remaining 5 components have 93738, 89686, 40319,
15884, and 4289 nodes, respectively.
