%-------------------------------------------------------------------------------
% SuiteSparse Matrix Collection, Tim Davis
% https://sparse.tamu.edu/Precima/analytics
% name: Precima/analytics
% [Precima/analytics: data analytics problem]
% id: 2851
% date: 2018
% author: C. Ugaz
% ed: T. Davis
% fields: name title A id date author ed kind notes
% kind: data analytics problem
%-------------------------------------------------------------------------------
% notes:
% Precima: data analytics problem                                        
%                                                                        
% Submitted by Carl Ugaz, Precima, Inc.  CUgaz@precima.com               
%                                                                        
% The matrix is nonsingular, ill-conditioned,, 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.                                   
%-------------------------------------------------------------------------------
