Matrix: HB/dwt_2680

Description: SYMMETRIC CONNECTION TABLE FROM DTNSRDC, WASHINGTON

HB/dwt_2680 graph
(undirected graph drawing)


HB/dwt_2680

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  • 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.
  • download in Matrix Market format, file size: 29 KB.
  • download in Rutherford/Boeing format, file size: 25 KB.

    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
    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 AMD52,498
    Cholesky flop count1.5e+06
    nnz(L+U), no partial pivoting, with AMD102,316
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD90,586
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD173,235

    SVD-based statistics:
    norm(A)11.509
    min(svd(A))1.01486e-18
    cond(A)1.13405e+19
    rank(A)2,640
    sprank(A)-rank(A)40
    null space dimension40
    full numerical rank?no
    singular value gap2.4791e+11

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

    HB/dwt_2680 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.