{
    matrix_id: '274',
    name: 'will57',
    group: 'HB',
    description: 'UNSYMMETRIC PATTERN OF ORDER  57 GIVEN BY WILLOUGHBY IN REID, 1970',
    author: 'R. Willoughby',
    editor: 'I. Duff, R. Grimes, J. Lewis',
    date: '1970',
    kind: 'semiconductor device problem',
    problem_2D_or_3D: '1',
    num_rows: '57',
    num_cols: '57',
    nonzeros: '281',
    num_explicit_zeros: '0',
    num_strongly_connected_components: '1',
    num_dmperm_blocks: '1',
    structural_full_rank: 'true',
    structural_rank: '57',
    pattern_symmetry: '0.866',
    numeric_symmetry: '0.866',
    rb_type: 'binary',
    structure: 'unsymmetric',
    cholesky_candidate: 'no',
    positive_definite: 'no',
    norm: '6.148686e+00',
    min_singular_value: '2.248575e-17',
    condition_number: '273448105243573344',
    svd_rank: '50',
    sprank_minus_rank: '7',
    null_space_dimension: '7',
    full_numerical_rank: 'no',
    svd_gap: '195656030044815.656250',
    image_files: 'will57.png,will57_svd.png,will57_APlusAT_graph.gif,will57_graph.gif,',
}
