• UF Sparse Matrix Collection
  • Matrix group: HB
  • Click here for a description of the HB group.
  • Click here for a list of all matrices
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  • Matrix: HB/ash958
  • Description: UNSYMMETRIC OVERDETERMINED PATTERN OF U.K. SURVEY. ASHKENAZI,1974
  • download as a MATLAB mat-file, file size: 4 KB. Use UFget(12) or UFget('HB/ash958') in MATLAB.
  • download in Matrix Market format
  • download in Rutherford/Boeing format

    HB/ash958

    Matrix properties
    number of rows958
    number of columns292
    nonzeros1,916
    structural full rank?yes
    structural rank292
    # of blocks from dmperm1
    # strongly connected comp.1
    entries not in dmperm blocks0
    explicit zero entries0
    nonzero pattern symmetry 0%
    numeric value symmetry 0%
    typebinary
    structurerectangular
    Cholesky candidate?no
    positive definite?no

    authorV. Askenazi
    editorA. Curtis, I. Duff, J. Reid
    date1974
    kindleast squares problem
    2D/3D problem?no

    Ordering statistics:AMD METIS
    nnz(V) for QR, upper bound nnz(L) for LU31,345 25,198
    nnz(R) for QR, upper bound nnz(U) for LU2,503 2,950

    Maintained by Tim Davis, last updated 05-Mar-2008.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.