Rucci/Rucci1 graph

Matrix: Rucci/Rucci1

Description: ill-conditioned least-squares problem, A. Rucci

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  • Matrix group: Rucci
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  • download as a MATLAB mat-file, file size: 55 MB. Use UFget(1881) or UFget('Rucci/Rucci1') in MATLAB.
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    Rucci/Rucci1

    Matrix properties
    number of rows1,977,885
    number of columns109,900
    nonzeros7,791,168
    structural full rank?yes
    structural rank109,900
    # of blocks from dmperm1
    # strongly connected comp.1
    entries not in dmperm blocks0
    explicit zero entries0
    nonzero pattern symmetry 0%
    numeric value symmetry 0%
    typereal
    structurerectangular
    Cholesky candidate?no
    positive definite?no

    authorA. Rucci
    editorT. Davis
    date2007
    kindleast squares problem
    2D/3D problem?no

    Ordering statistics:AMD METIS
    nnz(V) for QR, upper bound nnz(L) for LU2.483090e+10 1.577501e+10
    nnz(R) for QR, upper bound nnz(U) for LU181,438,851 127,757,606

    Maintained by Tim Davis, last updated 05-Nov-2008.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.
    Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.