Matrix: HB/hor_131

Description: UNSYMMETRIC MATRIX NNC R.P.HORNBY JANUARY,1983.

HB/hor_131 graph
(undirected graph drawing)

HB/hor_131

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  • Matrix group: HB
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  • download as a MATLAB mat-file, file size: 22 KB. Use UFget(167) or UFget('HB/hor_131') in MATLAB.
  • download in Matrix Market format, file size: 27 KB.
  • download in Rutherford/Boeing format, file size: 23 KB.

    Matrix properties
    number of rows434
    number of columns434
    nonzeros4,182
    # strongly connected comp.1
    explicit zero entries528
    nonzero pattern symmetrysymmetric
    numeric value symmetry 37%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorR. Hornby
    editorI. Duff, R. Grimes, J. Lewis
    date1983
    kinddirected weighted graph
    2D/3D problem?no

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 528 explicit zero entries.

    SVD-based statistics:
    norm(A)0.660744
    min(svd(A))1.53381e-05
    cond(A)43078.5
    rank(A)434
    null space dimension0
    full numerical rank?yes

    singular values (MAT file):click here
    SVD method used:s = svd (full (A)) ;
    status:ok

    HB/hor_131 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.