Matrix: Schenk_IBMNA/c-67

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

Schenk_IBMNA/c-67 graph
(undirected graph drawing)

Schenk_IBMNA/c-67 dmperm of Schenk_IBMNA/c-67

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  • download as a MATLAB mat-file, file size: 4 MB. Use UFget(952) or UFget('Schenk_IBMNA/c-67') in MATLAB.
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    Matrix properties
    number of rows57,975
    number of columns57,975
    nonzeros530,229
    structural full rank?yes
    structural rank57,975
    # of blocks from dmperm342
    # strongly connected comp.342
    explicit zero entries1,706
    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 57975-by-1

    Notes:

    next: Schenk_IBMNA/c-67b first: Schenk_IBMNA/c-67

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD441,224
    Cholesky flop count1.0e+07
    nnz(L+U), no partial pivoting, with AMD824,473
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD28,937,710
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD45,908,008

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 1706 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.