{
    matrix_id: '2087',
    name: 'n3c4-b3',
    group: 'JGD_Homology',
    description: 'Simplicial complexes from Homology from Volkmar Welker.',
    author: 'V. Welker',
    editor: 'J.-G. Dumas',
    date: '2008',
    kind: 'combinatorial problem',
    problem_2D_or_3D: '0',
    num_rows: '15',
    num_cols: '20',
    nonzeros: '60',
    num_explicit_zeros: '0',
    num_strongly_connected_components: '1',
    num_dmperm_blocks: '1',
    structural_full_rank: 'true',
    structural_rank: '15',
    pattern_symmetry: '0.000',
    numeric_symmetry: '0.000',
    rb_type: 'integer',
    structure: 'rectangular',
    cholesky_candidate: 'no',
    positive_definite: 'no',
    notes: 'Simplicial complexes from Homology from Volkmar Welker.     
From Jean-Guillaume Dumas\' Sparse Integer Matrix Collection,
http://ljk.imag.fr/membres/Jean-Guillaume.Dumas/simc.html   
                                                            
http://www.mathematik.uni-marburg.de/~welker/               
                                                            
Filename in JGD collection: Homology/n3c4.b3.15x20.sms      
',
    norm: '2.449490e+00',
    min_singular_value: '4.120283e-17',
    condition_number: '59449551523268032',
    svd_rank: '10',
    sprank_minus_rank: '5',
    null_space_dimension: '5',
    full_numerical_rank: 'no',
    svd_gap: '3516470645052297.500000',
    image_files: 'n3c4-b3.png,n3c4-b3_svd.png,n3c4-b3_graph.gif,',
}
