underdetermined system from ANSYS
Name Delor64K
Matrix ID 2651
Num Rows 64,719
Num Cols 1,785,345
Nonzeros 652,140
Pattern Entries 652,140
Kind Least Squares Problem
Symmetric No
Date 2011
Author E. Delor
Editor T. Davis
Structural Rank 64,719
Structural Rank Full true
Num Dmperm Blocks 1
Strongly Connect Components 1,623,009
Num Explicit Zeros 0
Pattern Symmetry 0%
Numeric Symmetry 0%
Cholesky Candidate no
Positive Definite no
Type real
Download MATLAB Rutherford Boeing Matrix Market
Goal is to find a permutation or factorization        
that places A in upper trapezoidal form, [R1 R2] where
R1 is well-conditioned, square, and upper triangular, 
and where R1\R2 is as sparse as possible.