Matrix: GHS_psdef/oilpan

Description: 1. TEST MATRIX FROM INPRO FOR PARASOL (OIL-PAN)

GHS_psdef/oilpan graph
(undirected graph drawing)


GHS_psdef/oilpan dmperm of GHS_psdef/oilpan

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  • Matrix group: GHS_psdef
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  • download as a MATLAB mat-file, file size: 11 MB. Use UFget(1270) or UFget('GHS_psdef/oilpan') in MATLAB.
  • download in Matrix Market format, file size: 10 MB.
  • download in Rutherford/Boeing format, file size: 8 MB.

    Matrix properties
    number of rows73,752
    number of columns73,752
    nonzeros2,148,558
    structural full rank?yes
    structural rank73,752
    # of blocks from dmperm17,459
    # strongly connected comp.17,459
    explicit zero entries1,448,630
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?yes
    positive definite?yes

    authorJ. Weiher
    editorJ. Koster
    date2004
    kindstructural problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD5,854,658
    Cholesky flop count1.8e+09
    nnz(L+U), no partial pivoting, with AMD11,635,564
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD19,614,906
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD41,653,938

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 1448630 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.