Matrix: GHS_psdef/ford2

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

GHS_psdef/ford2 graph
(undirected graph drawing)


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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
    structural full rank?yes
    structural rank100,196
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    Cholesky candidate?yes
    positive definite?no

    authorG. Kumfert, A. Pothen
    editorN. Gould, Y. Hu, J. Scott
    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.