{
    matrix_id: '1588',
    name: 'c-66b',
    group: 'Schenk_IBMNA',
    description: 'IBM TJ Watson, non-linear optimization',
    author: 'IBM',
    editor: 'O. Schenk',
    date: '2006',
    kind: 'subsequent optimization problem',
    problem_2D_or_3D: '0',
    num_rows: '49989',
    num_cols: '49989',
    nonzeros: '444851',
    num_explicit_zeros: '54156',
    num_strongly_connected_components: '7',
    num_dmperm_blocks: '7',
    structural_full_rank: 'true',
    structural_rank: '49989',
    pattern_symmetry: '1.000',
    numeric_symmetry: '1.000',
    rb_type: 'real',
    structure: 'symmetric',
    cholesky_candidate: 'no',
    positive_definite: 'no',
    notes: 'next: - first: Schenk_IBMNA/c-66                                       
An earlier version (Oct. 2003) of this matrix was obtained from Olaf   
Schenk, and appears here as Schenk_IBMNA/c-66.  However, it differs    
from the version posted on his web site as of Nov. 2006.   The new     
version appears here as Schenk_IBMNA/c-66b.   The two matrices are very
similar, but not identical.                                            
',
    b_field: 'full 49989-by-1
',
    image_files: 'c-66b.png,c-66b_dmperm.png,c-66b_graph.gif,',
}
