Matrix: HB/dwt_419

Description: SYMMETRIC CONNECTION TABLE FROM DTNSRDC, WASHINGTON

HB/dwt_419 graph
(undirected graph drawing)


HB/dwt_419

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  • Matrix group: HB
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  • download as a MATLAB mat-file, file size: 5 KB. Use UFget(125) or UFget('HB/dwt_419') in MATLAB.
  • download in Matrix Market format, file size: 5 KB.
  • download in Rutherford/Boeing format, file size: 4 KB.

    Matrix properties
    number of rows419
    number of columns419
    nonzeros3,563
    structural full rank?yes
    structural rank419
    # 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 AMD5,013
    Cholesky flop count7.4e+04
    nnz(L+U), no partial pivoting, with AMD9,607
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD6,487
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD13,002

    SVD-based statistics:
    norm(A)9.33913
    min(svd(A))1.7301e-19
    cond(A)5.39804e+19
    rank(A)370
    sprank(A)-rank(A)49
    null space dimension49
    full numerical rank?no
    singular value gap1.27309e+13

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

    HB/dwt_419 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.