Matrix: HB/plskz362

Description: PLATZMAN SKEW-SYMMETRIC FINITE DIFFERENCE MODEL OF ATLANTIC OCEAN

HB/plskz362 graph
(undirected graph drawing)


HB/plskz362 dmperm of HB/plskz362

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  • Matrix group: HB
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  • download as a MATLAB mat-file, file size: 14 KB. Use UFget(231) or UFget('HB/plskz362') in MATLAB.
  • download in Matrix Market format, file size: 11 KB.
  • download in Rutherford/Boeing format, file size: 11 KB.

    Matrix properties
    number of rows362
    number of columns362
    nonzeros1,760
    structural full rank?yes
    structural rank362
    # of blocks from dmperm3
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetry 0%
    typereal
    structureskew-symmetric
    Cholesky candidate?no
    positive definite?no

    authorJ. Lewis
    editorI. Duff, R. Grimes, J. Lewis
    date1975
    kind2D/3D problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD2,480
    Cholesky flop count2.0e+04
    nnz(L+U), no partial pivoting, with AMD4,598
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD3,962
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD8,028

    SVD-based statistics:
    norm(A)0.879931
    min(svd(A))1.88537e-06
    cond(A)466715
    rank(A)362
    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

    HB/plskz362 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.