Matrix: GHS_indef/darcy003

Description: DISCRETIZATION USING MIXED FE OF DARCY. ARIOLI AND MANZINI 2002.

GHS_indef/darcy003 graph
(undirected graph drawing)

GHS_indef/darcy003 dmperm of GHS_indef/darcy003
scc of GHS_indef/darcy003

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  • Matrix group: GHS_indef
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  • download as a MATLAB mat-file, file size: 11 MB. Use UFget(1232) or UFget('GHS_indef/darcy003') in MATLAB.
  • download in Matrix Market format, file size: 8 MB.
  • download in Rutherford/Boeing format, file size: 7 MB.

    Matrix properties
    number of rows389,874
    number of columns389,874
    nonzeros2,097,566
    structural full rank?yes
    structural rank389,874
    # of blocks from dmperm920
    # strongly connected comp.920
    explicit zero entries3,676
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?no
    positive definite?no

    authorM. Arioli, G. Manzini
    editorN. Gould, Y. Hu, J. Scott
    date2002
    kind2D/3D problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD5,782,318
    Cholesky flop count8.5e+08
    nnz(L+U), no partial pivoting, with AMD11,174,762
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD20,391,309
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD49,113,764

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 3676 explicit zero entries.

    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.