Matrix: HB/fs_183_4

Description: UNSYMMETRIC FACSIMILE CONVERGENCE MATRIX

HB/fs_183_4 graph HB/fs_183_4 graph
(bipartite graph drawing) (graph drawing of A+A')

HB/fs_183_4 dmperm of HB/fs_183_4

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  • Matrix group: HB
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  • download as a MATLAB mat-file, file size: 7 KB. Use UFget(143) or UFget('HB/fs_183_4') in MATLAB.
  • download in Matrix Market format, file size: 9 KB.
  • download in Rutherford/Boeing format, file size: 9 KB.

    Matrix properties
    number of rows183
    number of columns183
    nonzeros1,069
    structural full rank?yes
    structural rank183
    # of blocks from dmperm30
    # strongly connected comp.30
    explicit zero entries0
    nonzero pattern symmetry 42%
    numeric value symmetry 0%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

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

    Notes:

    next: HB/fs_183_6 first: HB/fs_183_1

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD1,255
    Cholesky flop count1.2e+04
    nnz(L+U), no partial pivoting, with AMD2,327
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD4,308
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD7,836

    SVD-based statistics:
    norm(A)1.12289e+09
    min(svd(A))0.00516051
    cond(A)2.17593e+11
    rank(A)183
    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_183_4 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.