HB/plat1919 graph

Matrix: HB/plat1919

Description: SPLATZMAN SYMMETRIC FINITE DIFFERENCE THREE OCEAN MODEL

  • UF Sparse Matrix Collection
  • Matrix group: HB
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  • download as a MATLAB mat-file, file size: 255 KB. Use UFget(228) or UFget('HB/plat1919') in MATLAB.
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    HB/plat1919

    Matrix properties
    number of rows1,919
    number of columns1,919
    nonzeros32,399
    structural full rank?yes
    structural rank1,919
    # of blocks from dmperm1
    # strongly connected comp.1
    entries not in dmperm blocks0
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?yes
    positive definite?yes

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

    Ordering statistics:AMD METIS
    nnz(chol(P*(A+A'+s*I)*P'))67,262 75,773
    Cholesky flop count3.0e+06 4.0e+06
    nnz(L+U), no partial pivoting132,605 149,627
    nnz(V) for QR, upper bound nnz(L) for LU77,872 102,619
    nnz(R) for QR, upper bound nnz(U) for LU147,384 192,803

    Maintained by Tim Davis, last updated 30-Sep-2008.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.
    Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.