Matrix: Schenk_IBMNA/c-73

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

Schenk_IBMNA/c-73 graph
(undirected graph drawing)

Schenk_IBMNA/c-73

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  • Matrix group: Schenk_IBMNA
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  • download as a MATLAB mat-file, file size: 10 MB. Use UFget(953) or UFget('Schenk_IBMNA/c-73') in MATLAB.
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    Matrix properties
    number of rows169,422
    number of columns169,422
    nonzeros1,279,274
    structural full rank?yes
    structural rank169,422
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    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 169422-by-1

    Notes:

    next: Schenk_IBMNA/c-73b first: Schenk_IBMNA/c-73

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD1,208,869
    Cholesky flop count9.7e+07
    nnz(L+U), no partial pivoting, with AMD2,248,316
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD3,212,415,880
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD3,593,886,023

    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.