HB/can_24 graph

Matrix: HB/can_24

Description: SYMMETRIC PATTERN FROM CANNES,LUCIEN MARRO,JUNE 1981.

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  • Matrix group: HB
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  • download as a MATLAB mat-file, file size: 674 bytes. Use UFget(97) or UFget('HB/can_24') in MATLAB.
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    HB/can_24

    Matrix properties
    number of rows24
    number of columns24
    nonzeros160
    structural full rank?yes
    structural rank24
    # of blocks from dmperm1
    # strongly connected comp.1
    entries not in dmperm blocks0
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typebinary
    structuresymmetric
    Cholesky candidate?yes
    positive definite?no

    authorL. Marro
    editorI. Duff, R. Grimes, J. Lewis
    date1981
    kindstructural problem
    2D/3D problem?yes

    Ordering statistics:AMD METIS
    nnz(chol(P*(A+A'+s*I)*P'))120 125
    Cholesky flop count6.6e+02 7.2e+02
    nnz(L+U), no partial pivoting216 226
    nnz(V) for QR, upper bound nnz(L) for LU134 132
    nnz(R) for QR, upper bound nnz(U) for LU196 212

    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.