Matrix: FIDAP/ex6

Description: TEST MATRIX FROM FIDAP: EX6.MAT

FIDAP/ex6 graph
(undirected graph drawing)


FIDAP/ex6 dmperm of FIDAP/ex6

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  • Matrix group: FIDAP
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  • download as a MATLAB mat-file, file size: 274 KB. Use UFget(437) or UFget('FIDAP/ex6') in MATLAB.
  • download in Matrix Market format, file size: 393 KB.
  • download in Rutherford/Boeing format, file size: 303 KB.

    Matrix properties
    number of rows1,651
    number of columns1,651
    nonzeros49,062
    structural full rank?yes
    structural rank1,651
    # of blocks from dmperm13
    # strongly connected comp.1
    explicit zero entries471
    nonzero pattern symmetrysymmetric
    numeric value symmetry 98%
    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 AMD43,746
    Cholesky flop count1.5e+06
    nnz(L+U), no partial pivoting, with AMD85,841
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD68,164
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD241,048

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 471 explicit zero entries.

    SVD-based statistics:
    norm(A)449.343
    min(svd(A))1.16425e-17
    cond(A)3.85949e+19
    rank(A)1,650
    sprank(A)-rank(A)1
    null space dimension1
    full numerical rank?no
    singular value gap5.93121e+13

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

    FIDAP/ex6 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.