Matrix: HB/well1033

Description: UNSYMMETRIC LEAST-SQUARES PROBLEM. SAUNDERS 1979.

HB/well1033 graph
(bipartite graph drawing)


HB/well1033 dmperm of HB/well1033

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  • Matrix group: HB
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  • download as a MATLAB mat-file, file size: 32 KB. Use UFget(260) or UFget('HB/well1033') in MATLAB.
  • download in Matrix Market format, file size: 33 KB.
  • download in Rutherford/Boeing format, file size: 29 KB.

    Matrix properties
    number of rows1,033
    number of columns320
    nonzeros4,732
    structural full rank?yes
    structural rank320
    # of blocks from dmperm15
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetry 0%
    numeric value symmetry 0%
    typereal
    structurerectangular
    Cholesky candidate?no
    positive definite?no

    authorM. Saunders
    editorI. Duff, R. Grimes, J. Lewis
    date1979
    kindleast squares problem
    2D/3D problem?no

    Additional fieldssize and type
    bfull 1033-by-1

    Ordering statistics:result
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD30,793
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD2,988

    SVD-based statistics:
    norm(A)1.80651
    min(svd(A))0.0108739
    cond(A)166.133
    rank(A)320
    sprank(A)-rank(A)0
    null space dimension0
    full numerical rank?yes

    singular values (MAT file):click here
    SVD method used:s = svd (full (A)) ;
    status:ok

    HB/well1033 svd

    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.