Matrix: Meszaros/t0331-4l

Description: linear programming problem, C. Meszaros test set

 (bipartite graph drawing)

• Matrix group: Meszaros
• download as a MATLAB mat-file, file size: 402 KB. Use UFget(1777) or UFget('Meszaros/t0331-4l') in MATLAB.

 Matrix properties number of rows 664 number of columns 46,915 nonzeros 430,982 structural full rank? yes structural rank 664 # of blocks from dmperm 1 # strongly connected comp. 1 explicit zero entries 0 nonzero pattern symmetry 0% numeric value symmetry 0% type binary 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 664-by-1 c full 46915-by-1 lo full 46915-by-1 hi full 46915-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 21,508,240 nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD 216,555

 SVD-based statistics: norm(A) 125.843 min(svd(A)) 0.407021 cond(A) 309.18 rank(A) 664 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