Matrix: Meszaros/dbir2

Description: linear programming problem, C. Meszaros test set

Meszaros/dbir2 graph
(bipartite graph drawing)

Meszaros/dbir2 dmperm of Meszaros/dbir2
scc of Meszaros/dbir2

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  • download as a MATLAB mat-file, file size: 2 MB. Use UFget(1706) or UFget('Meszaros/dbir2') in MATLAB.
  • download in Matrix Market format, file size: 4 MB.
  • download in Rutherford/Boeing format, file size: 2 MB.

    Matrix properties
    number of rows18,906
    number of columns45,877
    structural full rank?no
    structural rank18,904
    # of blocks from dmperm29
    # strongly connected comp.2,366
    explicit zero entries0
    nonzero pattern symmetry 0%
    numeric value symmetry 0%
    Cholesky candidate?no
    positive definite?no

    editorC. Meszaros
    kindlinear programming problem
    2D/3D problem?no

    Additional fieldssize and type
    bfull 18906-by-1
    cfull 45877-by-1
    lofull 45877-by-1
    hifull 45877-by-1
    z0full 1-by-1

    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 COLAMD41,117,320
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD3,005,677

    SVD-based statistics:
    null space dimension2
    full numerical rank?no
    singular value gapInf

    singular values (MAT file):click here
    SVD method used:s = svd (full (R)) ; where [~,R,E] = spqr (A') with droptol of zero
    status:SVD did not converge.

    Meszaros/dbir2 svd

    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.