Matrix: Simon/venkat25

Description: UNSTRUCTURED 2D EULER SOLVER, V. VENKATAKRISHNAN NASA, TIME STEP = 25

Simon/venkat25 graph
(undirected graph drawing)


Simon/venkat25

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  • Matrix group: Simon
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  • download as a MATLAB mat-file, file size: 14 MB. Use UFget(821) or UFget('Simon/venkat25') in MATLAB.
  • download in Matrix Market format, file size: 19 MB.
  • download in Rutherford/Boeing format, file size: 15 MB.

    Matrix properties
    number of rows62,424
    number of columns62,424
    nonzeros1,717,763
    structural full rank?yes
    structural rank62,424
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries29
    nonzero pattern symmetrysymmetric
    numeric value symmetry 6%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorV. Venkatakrishnan
    editorH. Simon
    date1993
    kindsubsequent computational fluid dynamics problem
    2D/3D problem?yes

    Additional fieldssize and type
    bfull 62424-by-1

    Notes:

    next: Simon/venkat50 first: Simon/venkat01
    

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD5,801,036
    Cholesky flop count1.1e+09
    nnz(L+U), no partial pivoting, with AMD11,539,648
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD10,689,206
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD21,078,156

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 29 explicit zero entries.

    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.