Matrix: Grund/poli4

Description: Economic problem from Friedrich Grund, Berlin

Grund/poli4 graph Grund/poli4 graph
(bipartite graph drawing) (graph drawing of A+A')

Grund/poli4 dmperm of Grund/poli4

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  • Matrix group: Grund
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  • download as a MATLAB mat-file, file size: 266 KB. Use UFget(2279) or UFget('Grund/poli4') in MATLAB.
  • download in Matrix Market format, file size: 322 KB.
  • download in Rutherford/Boeing format, file size: 288 KB.

    Matrix properties
    number of rows33,833
    number of columns33,833
    structural full rank?yes
    structural rank33,833
    # of blocks from dmperm33,628
    # strongly connected comp.33,628
    explicit zero entries0
    nonzero pattern symmetry 0%
    numeric value symmetry 0%
    Cholesky candidate?no
    positive definite?no

    authorF. Grund
    editorT. Davis
    kindeconomic problem
    2D/3D problem?no

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD117,954
    Cholesky flop count6.3e+06
    nnz(L+U), no partial pivoting, with AMD202,075
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD231,909
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD1,666,564

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

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

    Grund/poli4 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.