Nasa/barth5 graph

Matrix: Nasa/barth5

Description: BARTH5: Nasa matrix, but with a diagonal added to the original matrix

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  • Matrix group: Nasa
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  • download as a MATLAB mat-file, file size: 113 KB. Use UFget(756) or UFget('Nasa/barth5') in MATLAB.
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    Nasa/barth5

    dmperm of Nasa/barth5

    Matrix properties
    number of rows15,606
    number of columns15,606
    nonzeros61,484
    structural full rank?yes
    structural rank15,606
    # of blocks from dmperm1,155
    # strongly connected comp.1,155
    entries not in dmperm blocks4,519
    explicit zero entries0
    nonzero pattern symmetry 0%
    numeric value symmetry 0%
    typebinary
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorNASA
    editorG. Kumfert, A. Pothen
    date1995
    kindduplicate structural problem
    2D/3D problem?yes

    Notes:

    Let A=Nasa/barth5, then Pothen/barth5 = spones(A+A') with xyz coord.

    Ordering statistics:AMD METIS DMPERM+
    nnz(chol(P*(A+A'+s*I)*P'))368,416 363,248 289,097
    Cholesky flop count1.8e+07 1.6e+07 1.1e+07
    nnz(L+U), no partial pivoting721,226 710,890 567,107
    nnz(V) for QR, upper bound nnz(L) for LU211,062 226,364 167,646
    nnz(R) for QR, upper bound nnz(U) for LU416,482 430,076 334,258

    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.