Matrix: GHS_psdef/ford2

Description: Gould, Hu, & Scott: car surface mesh, from Pothen & Kumfert

GHS_psdef/ford2 graph
(undirected graph drawing)

GHS_psdef/ford2

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  • Matrix group: GHS_psdef
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  • download as a MATLAB mat-file, file size: 896 KB. Use UFget(1263) or UFget('GHS_psdef/ford2') in MATLAB.
  • download in Matrix Market format, file size: 841 KB.
  • download in Rutherford/Boeing format, file size: 790 KB.

    Matrix properties
    number of rows100,196
    number of columns100,196
    nonzeros544,688
    structural full rank?yes
    structural rank100,196
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typebinary
    structuresymmetric
    Cholesky candidate?yes
    positive definite?no

    authorG. Kumfert, A. Pothen
    editorN. Gould, Y. Hu, J. Scott
    date2004
    kindstructural problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD2,378,217
    Cholesky flop count2.9e+08
    nnz(L+U), no partial pivoting, with AMD4,656,238
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD6,147,771
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD11,610,612

    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.