Matrix: Rucci/Rucci1

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

Rucci/Rucci1 graph
(bipartite graph drawing)

Rucci/Rucci1

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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.
  • download in Matrix Market format, file size: 78 MB.
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    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
    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:result
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD24,830,899,021
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD181,438,851

    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.