Matrix: FIDAP/ex1

Description: TEST MATRIX FROM FIDAP: EX1.MAT

FIDAP/ex1 graph
(undirected graph drawing)


FIDAP/ex1

  • Home page of the UF Sparse Matrix Collection
  • Matrix group: FIDAP
  • Click here for a description of the FIDAP group.
  • Click here for a list of all matrices
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  • download as a MATLAB mat-file, file size: 21 KB. Use UFget(406) or UFget('FIDAP/ex1') in MATLAB.
  • download in Matrix Market format, file size: 28 KB.
  • download in Rutherford/Boeing format, file size: 23 KB.

    Matrix properties
    number of rows216
    number of columns216
    nonzeros4,317
    structural full rank?yes
    structural rank216
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries35
    nonzero pattern symmetrysymmetric
    numeric value symmetry 100%
    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 AMD4,284
    Cholesky flop count1.0e+05
    nnz(L+U), no partial pivoting, with AMD8,352
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD6,831
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD15,197

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 35 explicit zero entries.

    SVD-based statistics:
    norm(A)0.130188
    min(svd(A))3.94753e-06
    cond(A)32979.6
    rank(A)216
    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/ex1 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.