Matrix: Meszaros/dbir1

Description: linear programming problem, C. Meszaros test set

Meszaros/dbir1 graph
(bipartite graph drawing)

Meszaros/dbir1 dmperm of Meszaros/dbir1
scc of Meszaros/dbir1

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  • download as a MATLAB mat-file, file size: 830 KB. Use UFget(1705) or UFget('Meszaros/dbir1') in MATLAB.
  • download in Matrix Market format, file size: 3 MB.
  • download in Rutherford/Boeing format, file size: 1 MB.

    Matrix properties
    number of rows18,804
    number of columns45,775
    structural full rank?no
    structural rank18,802
    # of blocks from dmperm2
    # strongly connected comp.2,339
    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 18804-by-1
    cfull 45775-by-1
    lofull 45775-by-1
    hifull 45775-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 COLAMD39,796,562
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD2,849,474

    SVD-based statistics:
    null space dimension292
    full numerical rank?no
    singular value gap44846.2

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

    Meszaros/dbir1 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.