Matrix: JGD_Homology/cis-n4c6-b13

Description: Simplicial complexes from Homology from Volkmar Welker.

JGD_Homology/cis-n4c6-b13 graph
(bipartite graph drawing)


  • Home page of the UF Sparse Matrix Collection
  • 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: 201 KB. Use UFget(2046) or UFget('JGD_Homology/cis-n4c6-b13') in MATLAB.
  • download in Matrix Market format, file size: 306 KB.
  • download in Rutherford/Boeing format, file size: 234 KB.

    Matrix properties
    number of rows6,300
    number of columns25,605
    structural full rank?yes
    structural rank6,300
    # 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/cis.n4c6.b13.6300x25605.sms

    Ordering statistics:result
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD62,816,228
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD7,774,673

    SVD-based statistics:
    null space dimension860
    full numerical rank?no
    singular value gap3.06831e+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/cis-n4c6-b13 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.