HB/dwt_2680 graph

Matrix: HB/dwt_2680

Description: SYMMETRIC CONNECTION TABLE FROM DTNSRDC, WASHINGTON

  • UF Sparse Matrix Collection
  • Matrix group: HB
  • Click here for a description of the HB group.
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  • download as a MATLAB mat-file, file size: 26 KB. Use UFget(120) or UFget('HB/dwt_2680') in MATLAB.
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    HB/dwt_2680

    Matrix properties
    number of rows2,680
    number of columns2,680
    nonzeros25,026
    structural full rank?yes
    structural rank2,680
    # of blocks from dmperm1
    # strongly connected comp.1
    entries not in dmperm blocks0
    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:AMD METIS
    nnz(chol(P*(A+A'+s*I)*P'))52,498 62,582
    Cholesky flop count1.5e+06 2.3e+06
    nnz(L+U), no partial pivoting102,316 122,484
    nnz(V) for QR, upper bound nnz(L) for LU90,586 109,306
    nnz(R) for QR, upper bound nnz(U) for LU173,235 205,305

    Maintained by Tim Davis, last updated 30-Sep-2008.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.
    Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.