Matrix: Bai/rdb2048_noL

Description: REACTION-DIFFUSION BRUSSELATOR MODEL

Bai/rdb2048_noL graph
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Bai/rdb2048_noL

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  • download as a MATLAB mat-file, file size: 20 KB. Use UFget(1632) or UFget('Bai/rdb2048_noL') in MATLAB.
  • download in Matrix Market format, file size: 41 KB.
  • download in Rutherford/Boeing format, file size: 24 KB.

    Matrix properties
    number of rows2,048
    number of columns2,048
    nonzeros12,032
    structural full rank?yes
    structural rank2,048
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetry 79%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorK. Meerbergen
    editorZ. Bai, D. Day, J. Demmel, J. Dongarra
    date1994
    kindcomputational fluid dynamics problem
    2D/3D problem?yes

    Notes:

    This matrix (Bai/rdb2048_noL) is the NEP RDB2048 matrix.  It      
    differs from the Bai/rdb2048 matrix.  The Bai/rdb2048 and NEP     
    RDB2048L matrices are identical.  See the notes in Bai/rdb2048 for
    more details.                                                     
    

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD42,141
    Cholesky flop count1.8e+06
    nnz(L+U), no partial pivoting, with AMD82,234
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD76,629
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD140,021

    SVD-based statistics:
    norm(A)282.208
    min(svd(A))0.101597
    cond(A)2777.73
    rank(A)2,048
    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

    Bai/rdb2048_noL 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.