Matrix: HB/dwt_307

Description: SYMMETRIC CONNECTION TABLE FROM DTNSRDC, WASHINGTON

HB/dwt_307 graph
(undirected graph drawing)

HB/dwt_307

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  • Matrix group: HB
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  • download as a MATLAB mat-file, file size: 3 KB. Use UFget(121) or UFget('HB/dwt_307') in MATLAB.
  • download in Matrix Market format, file size: 3 KB.
  • download in Rutherford/Boeing format, file size: 3 KB.

    Matrix properties
    number of rows307
    number of columns307
    nonzeros2,523
    structural full rank?yes
    structural rank307
    # 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 AMD4,688
    Cholesky flop count9.5e+04
    nnz(L+U), no partial pivoting, with AMD9,069
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD6,877
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD12,494

    SVD-based statistics:
    norm(A)8.658
    min(svd(A))2.37732e-18
    cond(A)3.64192e+18
    rank(A)288
    sprank(A)-rank(A)19
    null space dimension19
    full numerical rank?no
    singular value gap2.15321e+12

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

    HB/dwt_307 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.