HB/bcsstk01 graph

Matrix: HB/bcsstk01

Description: SYMMETRIC STIFFNESS MATRIX SMALL GENERALIZED EIGENVALUE PROBLEM

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  • Matrix group: HB
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  • download as a MATLAB mat-file, file size: 2 KB. Use UFget(23) or UFget('HB/bcsstk01') in MATLAB.
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    HB/bcsstk01

    Matrix properties
    number of rows48
    number of columns48
    nonzeros400
    structural full rank?yes
    structural rank48
    # of blocks from dmperm1
    # strongly connected comp.1
    entries not in dmperm blocks0
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?yes
    positive definite?yes

    authorJ. Lewis
    editorI. Duff, R. Grimes, J. Lewis
    date1982
    kindstructural problem
    2D/3D problem?yes

    Ordering statistics:AMD METIS
    nnz(chol(P*(A+A'+s*I)*P'))489 484
    Cholesky flop count6.0e+03 5.8e+03
    nnz(L+U), no partial pivoting930 920
    nnz(V) for QR, upper bound nnz(L) for LU651 639
    nnz(R) for QR, upper bound nnz(U) for LU944 955

    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.