Matrix: Meszaros/co9

Description: linear programming problem, C. Meszaros test set

 (bipartite graph drawing)

• Matrix group: Meszaros
• download as a MATLAB mat-file, file size: 220 KB. Use UFget(1697) or UFget('Meszaros/co9') in MATLAB.

 Matrix properties number of rows 10,789 number of columns 22,924 nonzeros 109,651 structural full rank? yes structural rank 10,789 # of blocks from dmperm 96 # strongly connected comp. 123 explicit zero entries 0 nonzero pattern symmetry 0% numeric value symmetry 0% type real structure rectangular Cholesky candidate? no positive definite? no

 author editor C. Meszaros date 2004 kind linear programming problem 2D/3D problem? no

 Additional fields size and type b full 10789-by-1 c full 22924-by-1 lo full 22924-by-1 hi full 22924-by-1 z0 full 1-by-1

Notes:

```http://www.sztaki.hu/~meszaros/public_ftp/lptestset
Converted to standard form via Resende and Veiga's mpsrd:
minimize c'*x, subject to A*x=b and lo <= x <= hi
```

 Ordering statistics: result nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD 5,800,562 nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD 487,997

 SVD-based statistics: norm(A) 3958.1 min(svd(A)) 0.0682441 cond(A) 57999.1 rank(A) 10,789 sprank(A)-rank(A) 0 null space dimension 0 full numerical rank? yes

 singular values (MAT file): click here SVD method used: s = svd (full (R)) ; where [~,R,E] = spqr (A') with droptol of zero status: ok

Maintained by Tim Davis, last updated 12-Mar-2014.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.