HB/662_bus graph

Matrix: HB/662_bus

Description: S ADMITTANCE MATRIX 662 BUS POWER SYSTEM, D.J.TYLAVSKY, JULY 1985.

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  • Matrix group: HB
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  • download as a MATLAB mat-file, file size: 19 KB. Use UFget(3) or UFget('HB/662_bus') in MATLAB.
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    HB/662_bus

    Matrix properties
    number of rows662
    number of columns662
    nonzeros2,474
    structural full rank?yes
    structural rank662
    # 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

    authorD. Tylavsky
    editorI. Duff, R. Grimes, J. Lewis
    date1985
    kindpower network problem
    2D/3D problem?no

    Ordering statistics:AMD METIS
    nnz(chol(P*(A+A'+s*I)*P'))2,549 2,791
    Cholesky flop count1.3e+04 1.8e+04
    nnz(L+U), no partial pivoting4,436 4,920
    nnz(V) for QR, upper bound nnz(L) for LU4,320 4,758
    nnz(R) for QR, upper bound nnz(U) for LU8,365 9,140

    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.