Matrix: HB/blckhole

Description: S CONNECTIVITY STRUCTURE OF A GEODESIC DOME ON A COARSE BASE

HB/blckhole graph
(undirected graph drawing)


HB/blckhole dmperm of HB/blckhole

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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: 18 KB. Use UFget(81) or UFget('HB/blckhole') in MATLAB.
  • download in Matrix Market format, file size: 18 KB.
  • download in Rutherford/Boeing format, file size: 17 KB.

    Matrix properties
    number of rows2,132
    number of columns2,132
    nonzeros14,872
    structural full rank?yes
    structural rank2,132
    # of blocks from dmperm12
    # strongly connected comp.12
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typebinary
    structuresymmetric
    Cholesky candidate?yes
    positive definite?no

    authorE. Meyer
    editorI. Duff, R. Grimes, J. Lewis
    date1983
    kindstructural problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD52,117
    Cholesky flop count2.3e+06
    nnz(L+U), no partial pivoting, with AMD102,102
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD87,825
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD160,139

    SVD-based statistics:
    norm(A)8.231
    min(svd(A))0.00197537
    cond(A)4166.81
    rank(A)2,132
    sprank(A)-rank(A)0
    null space dimension0
    full numerical rank?yes

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

    HB/blckhole 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.