Matrix: Schenk_IBMNA/c-64

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

Schenk_IBMNA/c-64 graph
(undirected graph drawing)


Schenk_IBMNA/c-64

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  • Matrix group: Schenk_IBMNA
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  • download as a MATLAB mat-file, file size: 5 MB. Use UFget(950) or UFget('Schenk_IBMNA/c-64') in MATLAB.
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    Matrix properties
    number of rows51,035
    number of columns51,035
    nonzeros707,985
    structural full rank?yes
    structural rank51,035
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries9,856
    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 51035-by-1

    Notes:

    next: Schenk_IBMNA/c-64b first: Schenk_IBMNA/c-64
    

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD714,790
    Cholesky flop count5.1e+07
    nnz(L+U), no partial pivoting, with AMD1,378,545
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD164,995,256
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD214,333,915

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 9856 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.