• UF Sparse Matrix Collection
  • Matrix group: MathWorks
  • Click here for a description of the MathWorks group.
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  • Matrix: MathWorks/Kaufhold
  • Description: John Kaufhold, GE. Triggers bug in LU in MATLAB 6.5 on Windows (not Linux)
  • download as a MATLAB mat-file, file size: 306 KB. Use UFget(1404) or UFget('MathWorks/Kaufhold') in MATLAB.
  • download in Matrix Market format
  • download in Rutherford/Boeing format

    MathWorks/Kaufhold

    dmperm of MathWorks/Kaufhold

    MathWorks/Kaufhold graph

    Matrix properties
    number of rows8,765
    number of columns8,765
    nonzeros42,471
    structural full rank?yes
    structural rank8,765
    # of blocks from dmperm256
    # strongly connected comp.256
    entries not in dmperm blocks93
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetry 78%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorKaufhold
    editorT. Davis
    date2006
    kindcounter-example problem
    2D/3D problem?no

    Ordering statistics:AMD METIS DMPERM+
    nnz(chol(P*(A+A'+s*I)*P'))46,565 53,168 46,503
    Cholesky flop count4.4e+05 6.2e+05 4.4e+05
    nnz(L+U), no partial pivoting84,365 97,571 84,334
    nnz(V) for QR, upper bound nnz(L) for LU99,409 109,263 100,921
    nnz(R) for QR, upper bound nnz(U) for LU204,810 221,022 199,377

    Maintained by Tim Davis, last updated 04-May-2008.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.
    Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.