Matrix: FIDAP/ex37

Description: TEST MATRIX FROM FIDAP: EX37.MAT

FIDAP/ex37 graph
(undirected graph drawing)


FIDAP/ex37 dmperm of FIDAP/ex37

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  • Matrix group: FIDAP
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  • download as a MATLAB mat-file, file size: 452 KB. Use UFget(433) or UFget('FIDAP/ex37') in MATLAB.
  • download in Matrix Market format, file size: 630 KB.
  • download in Rutherford/Boeing format, file size: 534 KB.

    Matrix properties
    number of rows3,565
    number of columns3,565
    nonzeros67,591
    structural full rank?yes
    structural rank3,565
    # of blocks from dmperm1,652
    # strongly connected comp.1,652
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetry 95%
    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 AMD98,073
    Cholesky flop count6.9e+06
    nnz(L+U), no partial pivoting, with AMD192,581
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD144,196
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD398,386

    SVD-based statistics:
    norm(A)179.539
    min(svd(A))1
    cond(A)179.539
    rank(A)3,565
    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/ex37 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.