Matrix: JGD_Homology/cis-n4c6-b4

Description: Simplicial complexes from Homology from Volkmar Welker.

JGD_Homology/cis-n4c6-b4 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: 215 KB. Use UFget(2051) or UFget('JGD_Homology/cis-n4c6-b4') in MATLAB.
  • download in Matrix Market format, file size: 315 KB.
  • download in Rutherford/Boeing format, file size: 253 KB.

    Matrix properties
    number of rows20,058
    number of columns5,970
    structural full rank?yes
    structural rank5,970
    # 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.b4.20058x5970.sms

    Ordering statistics:result
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD75,730,284
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD14,281,060

    SVD-based statistics:
    null space dimension1,140
    full numerical rank?no
    singular value gap9.65788e+13

    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-b4 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.