Matrix: Meszaros/testbig

Description: linear programming problem, C. Meszaros test set

 (bipartite graph drawing)

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• Matrix group: Meszaros
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• download as a MATLAB mat-file, file size: 132 KB. Use UFget(1778) or UFget('Meszaros/testbig') in MATLAB.
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• download in Rutherford/Boeing format, file size: 182 KB.

 Matrix properties number of rows 17,613 number of columns 31,223 nonzeros 61,639 structural full rank? yes structural rank 17,613 # of blocks from dmperm 2 # strongly connected comp. 2 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 17613-by-1 c full 31223-by-1 lo full 31223-by-1 hi full 31223-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 39,472,394 nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD 5,526,199

 SVD-based statistics: norm(A) 40.1096 min(svd(A)) 0.059927 cond(A) 669.307 rank(A) 17,613 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

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

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.