GHS_indef/d_pretok graph

Matrix: GHS_indef/d_pretok

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

  • UF Sparse Matrix Collection
  • 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
  • download in Rutherford/Boeing format

    GHS_indef/d_pretok

    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
    entries not in dmperm blocks0
    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:AMD METIS
    nnz(chol(P*(A+A'+s*I)*P'))20,279,503 12,483,498
    Cholesky flop count1.5e+10 4.7e+09
    nnz(L+U), no partial pivoting40,376,276 24,784,266
    nnz(V) for QR, upper bound nnz(L) for LU119,338,099 53,664,947
    nnz(R) for QR, upper bound nnz(U) for LU281,279,672 154,192,185

    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.