Matrix: FIDAP/ex9

Description: TEST MATRIX FROM FIDAP: EX9.MAT

FIDAP/ex9 graph
(undirected graph drawing)


FIDAP/ex9

  • Home page of the UF Sparse Matrix Collection
  • Matrix group: FIDAP
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  • download as a MATLAB mat-file, file size: 578 KB. Use UFget(440) or UFget('FIDAP/ex9') in MATLAB.
  • download in Matrix Market format, file size: 498 KB.
  • download in Rutherford/Boeing format, file size: 425 KB.

    Matrix properties
    number of rows3,363
    number of columns3,363
    nonzeros99,471
    structural full rank?yes
    structural rank3,363
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?yes
    positive definite?yes

    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 AMD126,407
    Cholesky flop count6.4e+06
    nnz(L+U), no partial pivoting, with AMD249,451
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD313,241
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD861,697

    SVD-based statistics:
    norm(A)3.78703e+09
    min(svd(A))0.000324399
    cond(A)1.1674e+13
    rank(A)3,344
    sprank(A)-rank(A)19
    null space dimension19
    full numerical rank?no
    singular value gap1.35809

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

    FIDAP/ex9 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.