Matrix: HB/abb313

Description: UNSYMMETRIC OVERDETERMINED PATTERN OF SUDAN SURVEY. ABBAS,1974

HB/abb313 graph
(bipartite graph drawing)

HB/abb313
scc of HB/abb313

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  • Matrix group: HB
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  • download as a MATLAB mat-file, file size: 2 KB. Use UFget(5) or UFget('HB/abb313') in MATLAB.
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    Matrix properties
    number of rows313
    number of columns176
    nonzeros1,557
    structural full rank?yes
    structural rank176
    # of blocks from dmperm1
    # strongly connected comp.2
    explicit zero entries0
    nonzero pattern symmetry 0%
    numeric value symmetry 0%
    typebinary
    structurerectangular
    Cholesky candidate?no
    positive definite?no

    authorM. Abbas
    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 COLAMD11,528
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD1,597

    SVD-based statistics:
    norm(A)8.62457
    min(svd(A))4.72371e-18
    cond(A)1.8258e+18
    rank(A)128
    sprank(A)-rank(A)48
    null space dimension48
    full numerical rank?no
    singular value gap3.451e+13

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

    HB/abb313 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.