Matrix: GHS_psdef/gridgena

Description: Gould, Hu, & Scott: grid generation optimization (CUTEr)

GHS_psdef/gridgena graph
(undirected graph drawing)

GHS_psdef/gridgena

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  • Matrix group: GHS_psdef
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  • download as a MATLAB mat-file, file size: 839 KB. Use UFget(1311) or UFget('GHS_psdef/gridgena') in MATLAB.
  • download in Matrix Market format, file size: 1 MB.
  • download in Rutherford/Boeing format, file size: 750 KB.

    Matrix properties
    number of rows48,962
    number of columns48,962
    nonzeros512,084
    structural full rank?yes
    structural rank48,962
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?yes
    positive definite?yes

    authorP. Barrera, A. Perez, L. Castellanos
    editorP. Toint
    date1991
    kindoptimization problem
    2D/3D problem?no

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD2,752,623
    Cholesky flop count3.7e+08
    nnz(L+U), no partial pivoting, with AMD5,456,284
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD4,472,922
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD8,677,276

    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.