Matrix: GHS_indef/c-59

Description: Schenk: IBM TJ Watson, Yorktown, nonlinear optimization

GHS_indef/c-59 graph
(undirected graph drawing)


GHS_indef/c-59

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  • Matrix group: GHS_indef
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  • download as a MATLAB mat-file, file size: 3 MB. Use UFget(1222) or UFget('GHS_indef/c-59') in MATLAB.
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    Matrix properties
    number of rows41,282
    number of columns41,282
    nonzeros480,536
    structural full rank?yes
    structural rank41,282
    # 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
    date2004
    kindoptimization problem
    2D/3D problem?no

    Additional fieldssize and type
    bfull 41282-by-1

    Notes:

    Revised Nov 2006; relative eps changes to A, right-hand-side added.
    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 AMD3,167,964
    Cholesky flop count2.9e+09
    nnz(L+U), no partial pivoting, with AMD6,294,646
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD85,760,889
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD120,680,899

    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.