Matrix: HB/fs_680_1

Description: UNSYMMETRIC FACSIMILE CONVERGENCE MATRIX

HB/fs_680_1 graph HB/fs_680_1 graph
(bipartite graph drawing) (graph drawing of A+A')

HB/fs_680_1 dmperm of HB/fs_680_1

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  • Matrix group: HB
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  • download as a MATLAB mat-file, file size: 18 KB. Use UFget(149) or UFget('HB/fs_680_1') in MATLAB.
  • download in Matrix Market format, file size: 22 KB.
  • download in Rutherford/Boeing format, file size: 21 KB.

    Matrix properties
    number of rows680
    number of columns680
    nonzeros2,184
    structural full rank?yes
    structural rank680
    # of blocks from dmperm446
    # strongly connected comp.446
    explicit zero entries462
    nonzero pattern symmetry 51%
    numeric value symmetry 0%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorA. Curtis
    editorI. Duff, R. Grimes, J. Lewis
    date1983
    kind2D/3D problem sequence
    2D/3D problem?yes

    Notes:

    next: HB/fs_680_2 first: HB/fs_680_1

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD2,454
    Cholesky flop count1.3e+04
    nnz(L+U), no partial pivoting, with AMD4,228
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD1,980
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD3,750

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 462 explicit zero entries.

    SVD-based statistics:
    norm(A)7.19149e+13
    min(svd(A))4.66822e+09
    cond(A)15405.2
    rank(A)680
    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/fs_680_1 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.