Matrix: HB/ash331

Description: UNSYMMETRIC OVERDETERMINED PATTERN OF SCOTLAND SURVEY. ASHKENAZI,1974

HB/ash331 graph
(bipartite graph drawing)


HB/ash331

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  • Matrix group: HB
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  • download as a MATLAB mat-file, file size: 2 KB. Use UFget(9) or UFget('HB/ash331') in MATLAB.
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  • download in Rutherford/Boeing format, file size: 2 KB.

    Matrix properties
    number of rows331
    number of columns104
    nonzeros662
    structural full rank?yes
    structural rank104
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetry 0%
    numeric value symmetry 0%
    typebinary
    structurerectangular
    Cholesky candidate?no
    positive definite?no

    authorV. Askenazi
    editorA. Curtis, I. Duff, J. Reid
    date1974
    kindleast squares problem
    2D/3D problem?no

    Ordering statistics:result
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD6,085
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD744

    SVD-based statistics:
    norm(A)4.15069
    min(svd(A))1.34044
    cond(A)3.09651
    rank(A)104
    sprank(A)-rank(A)0
    null space dimension0
    full numerical rank?yes

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

    HB/ash331 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.