Matrix: GHS_psdef/hood

Description: INDEED Test Matrix (DC-mh)

GHS_psdef/hood graph
(undirected graph drawing)

GHS_psdef/hood dmperm of GHS_psdef/hood

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  • Matrix group: GHS_psdef
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  • download as a MATLAB mat-file, file size: 73 MB. Use UFget(1266) or UFget('GHS_psdef/hood') in MATLAB.
  • download in Matrix Market format, file size: 55 MB.
  • download in Rutherford/Boeing format, file size: 45 MB.

    Matrix properties
    number of rows220,542
    number of columns220,542
    structural full rank?yes
    structural rank220,542
    # of blocks from dmperm9,908
    # strongly connected comp.9,908
    explicit zero entries873,014
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    Cholesky candidate?yes
    positive definite?yes

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

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD24,256,888
    Cholesky flop count7.6e+09
    nnz(L+U), no partial pivoting, with AMD48,293,234
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD96,966,277
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD216,940,098

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 873014 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.