Matrix: Nasa/shuttle_eddy

Description: SHUTTLE_EDDY: Nasa matrix, but with diagonal added to original matrix

Nasa/shuttle_eddy graph
(undirected graph drawing)


Nasa/shuttle_eddy

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  • Matrix group: Nasa
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  • download as a MATLAB mat-file, file size: 91 KB. Use UFget(763) or UFget('Nasa/shuttle_eddy') in MATLAB.
  • download in Matrix Market format, file size: 112 KB.
  • download in Rutherford/Boeing format, file size: 95 KB.

    Matrix properties
    number of rows10,429
    number of columns10,429
    nonzeros103,599
    structural full rank?yes
    structural rank10,429
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typebinary
    structuresymmetric
    Cholesky candidate?yes
    positive definite?no

    authorNASA
    editorG. Kumfert, A. Pothen
    date1995
    kindduplicate structural problem
    2D/3D problem?yes

    Notes:

    Identical to Pothen/shuttle_eddy; the latter has xyz coordinates.
    

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD326,936
    Cholesky flop count1.7e+07
    nnz(L+U), no partial pivoting, with AMD643,443
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD566,762
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD1,108,728

    SVD-based statistics:
    norm(A)16.1416
    min(svd(A))1.1553e-18
    cond(A)1.39717e+19
    rank(A)9,757
    sprank(A)-rank(A)672
    null space dimension672
    full numerical rank?no
    singular value gap7.0787e+11

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

    Nasa/shuttle_eddy 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.