Matrix: Schenk_IBMNA/c-66

Description: Olaf Schenk, Univ. Basel: IBM TJ Watson, Yorktown, nonlinear optimization

Schenk_IBMNA/c-66 graph
(undirected graph drawing)


Schenk_IBMNA/c-66 dmperm of Schenk_IBMNA/c-66

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  • download as a MATLAB mat-file, file size: 2 MB. Use UFget(951) or UFget('Schenk_IBMNA/c-66') in MATLAB.
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    Matrix properties
    number of rows49,989
    number of columns49,989
    nonzeros444,853
    structural full rank?yes
    structural rank49,989
    # of blocks from dmperm6
    # strongly connected comp.6
    explicit zero entries54,154
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?no
    positive definite?no

    authorIBM
    editorO. Schenk
    date2003
    kindoptimization problem sequence
    2D/3D problem?no

    Additional fieldssize and type
    bfull 49989-by-1

    Notes:

    next: Schenk_IBMNA/c-66b first: Schenk_IBMNA/c-66
    

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD1,009,419
    Cholesky flop count2.7e+08
    nnz(L+U), no partial pivoting, with AMD1,968,849
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD79,558,463
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD174,206,755

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 54154 explicit zero entries.

    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.