Matrix: GHS_indef/sparsine

Description: Gould, Hu, & Scott: structurual optimization (CUTEr)

GHS_indef/sparsine graph
(undirected graph drawing)


GHS_indef/sparsine

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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: 8 MB. Use UFget(1308) or UFget('GHS_indef/sparsine') in MATLAB.
  • download in Matrix Market format, file size: 6 MB.
  • download in Rutherford/Boeing format, file size: 6 MB.

    Matrix properties
    number of rows50,000
    number of columns50,000
    nonzeros1,548,988
    structural full rank?yes
    structural rank50,000
    # 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

    authorN. Gould
    editorN. Gould
    date1995
    kindstructural problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD552,420,000
    Cholesky flop count1.1e+13
    nnz(L+U), no partial pivoting, with AMD1,104,790,000
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD537,136,477
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD798,490,345

    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.