Matrix: Grund/poli

Description: Unsymmetric Matrix poli, FU Berlin, Aug 1993.

Grund/poli graph Grund/poli graph
(bipartite graph drawing) (graph drawing of A+A')

Grund/poli dmperm of Grund/poli

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  • Matrix group: Grund
  • Click here for a description of the Grund group.
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  • download as a MATLAB mat-file, file size: 27 KB. Use UFget(467) or UFget('Grund/poli') in MATLAB.
  • download in Matrix Market format, file size: 33 KB.
  • download in Rutherford/Boeing format, file size: 30 KB.

    Matrix properties
    number of rows4,008
    number of columns4,008
    structural full rank?yes
    structural rank4,008
    # of blocks from dmperm3,943
    # strongly connected comp.3,943
    explicit zero entries0
    nonzero pattern symmetry 3%
    numeric value symmetry 0%
    Cholesky candidate?no
    positive definite?no

    authorF. Grund
    editorF. Grund
    kindeconomic problem
    2D/3D problem?no

    Additional fieldssize and type
    bfull 4008-by-1

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD8,584
    Cholesky flop count2.1e+04
    nnz(L+U), no partial pivoting, with AMD13,160
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD6,525
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD35,756

    SVD-based statistics:
    null space dimension0
    full numerical rank?yes

    singular values (MAT file):click here
    SVD method used:s = svd (full (A)) ;

    Grund/poli svd

    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.