Matrix: Schenk_IBMNA/c-62

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

Schenk_IBMNA/c-62 graph
(undirected graph drawing)


Schenk_IBMNA/c-62 dmperm of Schenk_IBMNA/c-62

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  • download as a MATLAB mat-file, file size: 5 MB. Use UFget(949) or UFget('Schenk_IBMNA/c-62') in MATLAB.
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    Matrix properties
    number of rows41,731
    number of columns41,731
    nonzeros559,341
    structural full rank?yes
    structural rank41,731
    # of blocks from dmperm2
    # strongly connected comp.2
    explicit zero entries2
    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 41731-by-1

    Notes:

    next: GHS_indef/c-62ghs first: Schenk_IBMNA/c-62                   
    Note that this matrix should have been placed in the Schenk_IBMNA/ 
    directory when it was first added in August 2004, but moving it now
    would disrupt exising users of the collection.                     
    

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD9,819,876
    Cholesky flop count1.7e+10
    nnz(L+U), no partial pivoting, with AMD19,598,021
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD125,386,645
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD173,367,965

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 2 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.