Matrix properties
number of rows	343,236
number of columns	887,058
nonzeros	4,211,599
structural full rank?	yes
structural rank	343,236
# of blocks from dmperm	1
# strongly connected comp.	437,423
explicit zero entries	0
nonzero pattern symmetry	0%
numeric value symmetry	0%
type	real
structure	rectangular
Cholesky candidate?	no
positive definite?	no

author	E. Delor
editor	T. Davis
date	2011
kind	least squares problem
2D/3D problem?	no

Notes:

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.             

Ordering statistics:	result
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	116,855,252
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	53,456,930

For a description of the statistics displayed above, click here.

Maintained by Tim Davis, last updated 04-Jun-2015.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.