Matrix: Schenk_IBMNA/c-65

Description: IBM TJ Watson, non-linear optimization

Schenk_IBMNA/c-65 graph
(undirected graph drawing)

Schenk_IBMNA/c-65 dmperm of Schenk_IBMNA/c-65

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  • Matrix group: Schenk_IBMNA
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  • download as a MATLAB mat-file, file size: 2 MB. Use UFget(1578) or UFget('Schenk_IBMNA/c-65') in MATLAB.
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    Matrix properties
    number of rows48,066
    number of columns48,066
    nonzeros360,428
    structural full rank?yes
    structural rank48,066
    # of blocks from dmperm51
    # strongly connected comp.51
    explicit zero entries100
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?no
    positive definite?no

    authorIBM
    editorO. Schenk
    date2006
    kindoptimization problem
    2D/3D problem?no

    Additional fieldssize and type
    bfull 48066-by-1

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD690,538
    Cholesky flop count7.4e+07
    nnz(L+U), no partial pivoting, with AMD1,333,010
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD62,012,170
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD97,561,036

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 100 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.