Matrix: FIDAP/ex27

Description: TEST MATRIX FROM FIDAP: EX27.MAT

FIDAP/ex27 graph
(undirected graph drawing)


FIDAP/ex27 dmperm of FIDAP/ex27

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  • Matrix group: FIDAP
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  • download as a MATLAB mat-file, file size: 226 KB. Use UFget(424) or UFget('FIDAP/ex27') in MATLAB.
  • download in Matrix Market format, file size: 362 KB.
  • download in Rutherford/Boeing format, file size: 285 KB.

    Matrix properties
    number of rows974
    number of columns974
    nonzeros37,652
    structural full rank?yes
    structural rank974
    # of blocks from dmperm2
    # strongly connected comp.1
    explicit zero entries3,130
    nonzero pattern symmetrysymmetric
    numeric value symmetry 53%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorA. Baggag, Y. Saad
    editorA. Baggag, Y. Saad
    date1994
    kindcomputational fluid dynamics problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD33,167
    Cholesky flop count1.4e+06
    nnz(L+U), no partial pivoting, with AMD65,360
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD43,529
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD132,548

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 3130 explicit zero entries.

    SVD-based statistics:
    norm(A)0.259777
    min(svd(A))2.52764e-07
    cond(A)1.02774e+06
    rank(A)974
    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

    FIDAP/ex27 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.