Matrix: HB/can_634

Description: SYMMETRIC PATTERN FROM CANNES,LUCIEN MARRO,JUNE 1981.

HB/can_634 graph
(undirected graph drawing)


HB/can_634

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  • Matrix group: HB
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  • download as a MATLAB mat-file, file size: 8 KB. Use UFget(104) or UFget('HB/can_634') in MATLAB.
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    Matrix properties
    number of rows634
    number of columns634
    nonzeros7,228
    structural full rank?yes
    structural rank634
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typebinary
    structuresymmetric
    Cholesky candidate?yes
    positive definite?no

    authorL. Marro
    editorI. Duff, R. Grimes, J. Lewis
    date1981
    kindstructural problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD15,793
    Cholesky flop count6.7e+05
    nnz(L+U), no partial pivoting, with AMD30,952
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD28,006
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD53,529

    SVD-based statistics:
    norm(A)13.8622
    min(svd(A))1.40039e-17
    cond(A)9.89877e+17
    rank(A)586
    sprank(A)-rank(A)48
    null space dimension48
    full numerical rank?no
    singular value gap3.10827e+11

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

    HB/can_634 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.