Matrix: GHS_psdef/audikw_1

Description: symmetric rb matrix

GHS_psdef/audikw_1 graph
(undirected graph drawing)

GHS_psdef/audikw_1

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  • Matrix group: GHS_psdef
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  • download as a MATLAB mat-file, file size: 505 MB. Use UFget(1252) or UFget('GHS_psdef/audikw_1') in MATLAB.
  • download in Matrix Market format, file size: 418 MB.
  • download in Rutherford/Boeing format, file size: 346 MB.

    Matrix properties
    number of rows943,695
    number of columns943,695
    nonzeros77,651,847
    structural full rank?yes
    structural rank943,695
    # 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

    authorS. Mayer
    editorJ. Koster
    date2004
    kindstructural problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD2,326,481,622
    Cholesky flop count2.1e+13
    nnz(L+U), no partial pivoting, with AMD4,652,019,549
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD3,897,000,183
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD9,646,604,127

    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.