Matrix: FIDAP/ex13

Description: TEST MATRIX FROM FIDAP: EX13.MAT

FIDAP/ex13 graph
(undirected graph drawing)


FIDAP/ex13

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  • Matrix group: FIDAP
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  • download as a MATLAB mat-file, file size: 514 KB. Use UFget(411) or UFget('FIDAP/ex13') in MATLAB.
  • download in Matrix Market format, file size: 455 KB.
  • download in Rutherford/Boeing format, file size: 383 KB.

    Matrix properties
    number of rows2,568
    number of columns2,568
    nonzeros75,628
    structural full rank?yes
    structural rank2,568
    # 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 AMD81,264
    Cholesky flop count3.1e+06
    nnz(L+U), no partial pivoting, with AMD159,960
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD158,890
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD444,278

    SVD-based statistics:
    norm(A)1.25842e+10
    min(svd(A))1.06027e-05
    cond(A)1.18688e+15
    rank(A)1,434
    sprank(A)-rank(A)1,134
    null space dimension1,134
    full numerical rank?no
    singular value gap1.00404

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

    FIDAP/ex13 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.