%-------------------------------------------------------------------------------
% UF Sparse Matrix Collection, Tim Davis
% http://www.cise.ufl.edu/research/sparse/matrices/MathWorks/TS
% name: MathWorks/TS
% [x=A\b triggers a bug in MATLAB R2009a and earlier]
% id: 2256
% date: 2009
% author: P. Quillen
% ed: T. Davis
% fields: name title A b id date author ed kind notes
% kind: counter-example problem
%-------------------------------------------------------------------------------
% notes:
% This is a structurally singular matrix that triggers a bug in the   
% 2-by-2 pivoting strategy in UMFPACK versions 4.1 through 5.3.       
% The bug thus exists in MATLAB R2006b through R2009a.  It was        
% fixed in UMFPACK 5.4 and MATLAB R2009b.  Contributed by Pat Quillen,
% The MathWorks, Inc.  The sprank(A) and rank(A) are 2140.            
%-------------------------------------------------------------------------------
