Matrix: JGD_Homology/ch7-8-b3

Description: Simplicial complexes from Homology from Volkmar Welker.

JGD_Homology/ch7-8-b3 graph
(bipartite graph drawing)


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  • Matrix group: JGD_Homology
  • Click here for a description of the JGD_Homology group.
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  • download as a MATLAB mat-file, file size: 507 KB. Use UFget(2032) or UFget('JGD_Homology/ch7-8-b3') in MATLAB.
  • download in Matrix Market format, file size: 718 KB.
  • download in Rutherford/Boeing format, file size: 576 KB.

    Matrix properties
    number of rows58,800
    number of columns11,760
    structural full rank?yes
    structural rank11,760
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetry 0%
    numeric value symmetry 0%
    Cholesky candidate?no
    positive definite?no

    authorV. Welker
    editorJ.-G. Dumas
    kindcombinatorial problem
    2D/3D problem?no


    Simplicial complexes from Homology from Volkmar Welker.      
    From Jean-Guillaume Dumas' Sparse Integer Matrix Collection,    
    Filename in JGD collection: Homology/ch7-8.b3.58800x11760.sms

    Ordering statistics:result
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD445,393,872
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD49,974,878

    SVD-based statistics:
    null space dimension1,121
    full numerical rank?no
    singular value gap1.66458e+14

    singular values (MAT file):click here
    SVD method used:s = svd (full (R)) ; where [~,R,E] = spqr (A) with droptol of zero

    JGD_Homology/ch7-8-b3 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.