GHS_indef/aug2d graph

Matrix: GHS_indef/aug2d

Description: Gould, Hu, & Scott: expanded system-2D PDE (CUTEr)

  • 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: 137 KB. Use UFget(1215) or UFget('GHS_indef/aug2d') in MATLAB.
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    GHS_indef/aug2d

    dmperm of GHS_indef/aug2d

    Matrix properties
    number of rows29,008
    number of columns29,008
    nonzeros76,832
    structural full rank?no
    structural rank19,208
    # of blocks from dmperm2
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typeinteger
    structuresymmetric
    Cholesky candidate?no
    positive definite?no

    authorN. Gould
    editorN. Gould
    date1994
    kind2D/3D problem
    2D/3D problem?yes

    Ordering statistics:AMD METIS
    nnz(chol(P*(A+A'+s*I)*P'))248,374 285,794
    Cholesky flop count1.1e+07 1.3e+07
    nnz(L+U), no partial pivoting467,740 542,580
    nnz(V) for QR, upper bound nnz(L) for LU3,305,290 2,731,376
    nnz(R) for QR, upper bound nnz(U) for LU602,205 674,733

    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.