Matrix: HB/dwt_72

Description: SYMMETRIC CONNECTION TABLE FROM DTNSRDC, WASHINGTON

HB/dwt_72 graph
(undirected graph drawing)


HB/dwt_72

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  • Matrix group: HB
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  • download as a MATLAB mat-file, file size: 862 bytes. Use UFget(133) or UFget('HB/dwt_72') in MATLAB.
  • download in Matrix Market format, file size: 751 bytes.
  • download in Rutherford/Boeing format, file size: 827 bytes.

    Matrix properties
    number of rows72
    number of columns72
    nonzeros222
    structural full rank?yes
    structural rank72
    # 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

    authorG. Everstine, D. Taylor
    editorI. Duff, R. Grimes, J. Lewis
    date1980
    kindstructural problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD184
    Cholesky flop count4.9e+02
    nnz(L+U), no partial pivoting, with AMD296
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD192
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD321

    SVD-based statistics:
    norm(A)3.49232
    min(svd(A))1.60781e-16
    cond(A)2.1721e+16
    rank(A)70
    sprank(A)-rank(A)2
    null space dimension2
    full numerical rank?no
    singular value gap8.30154e+13

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

    HB/dwt_72 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.