Matrix: GHS_indef/d_pretok

Description: Aug. system modelling the underground of Straz pod Ralskem mine by MFE

GHS_indef/d_pretok graph
(undirected graph drawing)

GHS_indef/d_pretok

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  • Matrix group: GHS_indef
  • Click here for a description of the GHS_indef group.
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  • download as a MATLAB mat-file, file size: 9 MB. Use UFget(1231) or UFget('GHS_indef/d_pretok') in MATLAB.
  • download in Matrix Market format, file size: 6 MB.
  • download in Rutherford/Boeing format, file size: 5 MB.

    Matrix properties
    number of rows182,730
    number of columns182,730
    nonzeros1,641,672
    structural full rank?yes
    structural rank182,730
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?no
    positive definite?no

    author
    editorN. Gould, Y. Hu, J. Scott
    date2004
    kind2D/3D problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD20,279,503
    Cholesky flop count1.5e+10
    nnz(L+U), no partial pivoting, with AMD40,376,276
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD119,338,099
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD281,279,672

    For a description of the statistics displayed above, click here.

    Maintained by Tim Davis, last updated 12-Mar-2014.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.
    Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.