Matrix: HB/plsk1919

Description: PLATZMAN SKEW-SYMMETRIC FINITE DIFFERENCE THREE OCEAN MODEL

HB/plsk1919 graph
(undirected graph drawing)


HB/plsk1919 dmperm of HB/plsk1919

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  • Matrix group: HB
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  • download as a MATLAB mat-file, file size: 78 KB. Use UFget(230) or UFget('HB/plsk1919') in MATLAB.
  • download in Matrix Market format, file size: 54 KB.
  • download in Rutherford/Boeing format, file size: 55 KB.

    Matrix properties
    number of rows1,919
    number of columns1,919
    nonzeros9,662
    structural full rank?yes
    structural rank1,919
    # of blocks from dmperm11
    # 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 AMD16,733
    Cholesky flop count2.0e+05
    nnz(L+U), no partial pivoting, with AMD31,547
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD31,694
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD66,710

    SVD-based statistics:
    norm(A)1.70928
    min(svd(A))8.47117e-17
    cond(A)2.01776e+16
    rank(A)1,918
    sprank(A)-rank(A)1
    null space dimension1
    full numerical rank?no
    singular value gap3.89481e+09

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

    HB/plsk1919 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.