• UF Sparse Matrix Collection
  • Matrix group: Gaertner
  • Click here for a description of the Gaertner group.
  • Click here for a list of all matrices
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  • Matrix: Gaertner/nopoly
  • Description: Structuresymmetric Matrix nopoly K. Gaertner ETH Zurich Jan 1998.
  • download as a MATLAB mat-file, file size: 137 KB. Use UFget(442) or UFget('Gaertner/nopoly') in MATLAB.
  • download in Matrix Market format
  • download in Rutherford/Boeing format

    Gaertner/nopoly

    Gaertner/nopoly graph

    Matrix properties
    number of rows10,774
    number of columns10,774
    nonzeros70,842
    structural full rank?yes
    structural rank10,774
    # of blocks from dmperm1
    # strongly connected comp.1
    entries not in dmperm blocks0
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typeinteger
    structuresymmetric
    Cholesky candidate?yes
    positive definite?no

    authorK. Gaertner
    editorF. Grund
    date2001
    kindundirected weighted graph
    2D/3D problem?no

    Ordering statistics:AMD METIS
    nnz(chol(P*(A+A'+s*I)*P'))163,985 167,565
    Cholesky flop count4.6e+06 4.4e+06
    nnz(L+U), no partial pivoting317,196 324,356
    nnz(V) for QR, upper bound nnz(L) for LU222,086 248,735
    nnz(R) for QR, upper bound nnz(U) for LU423,762 468,921

    Maintained by Tim Davis, last updated 04-May-2008.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.
    Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.