• SJSU Singular Matrix Database
  • Matrix group: Grund
  • Click here for a description of the Grund group.
  • Click here for a list of all matrices
  • Click here for a list of all matrix groups


  • Matrix: Grund/bayer07
  • Description: Unsymmetric Matrix bayer07, Bayer AG, F. Grund, Oct 1995.
  • download as a MATLAB mat-file, file size: 85 KB. Use SJget(56) or SJget('Grund/bayer07') in MATLAB.
  • download in Matrix Market format, file size: 132 KB.
  • download in Rutherford/Boeing format, file size: 98 KB.

    Grund/bayer07

    Routine svd from Matlab 7.6.0.324 (R2008a) used to calculate the singular values.

    Grund/bayer07

    dmperm of Grund/bayer07

    Matrix properties (click for a legend)  
    number of rows3,268
    number of columns3,268
    structural full rank?yes
    structural rank3,268
    numerical rank 1,666
    dimension of the numerical null space1,602
    numerical rank / min(size(A))0.50979
    Euclidean norm of A 2.4972e+012
    calculated singular value # 16661.5976
    numerical rank defined using a tolerance
    max(size(A))*eps(norm(A)) =
    1.5957
    calculated singular value # 16671.58
    gap in the singular values at the numerical rank:
    singular value # 1666 / singular value # 1667
    1.0111
    calculated condition number8.0597e+026
    condest1.2686e+027
    nonzeros20,963
    # of blocks from dmperm3,037
    # strongly connected comp.1
    entries not in dmperm blocks16,718
    explicit zero entries6,873
    nonzero pattern symmetry 1%
    numeric value symmetry 0%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorBayer
    editorF. Grund
    date1997
    kindchemical process simulation problem
    2D/3D problem?no
    SJid56
    UFid458

    Ordering statistics:AMD METIS DMPERM+
    nnz(chol(P*(A+A'+s*I)*P'))614,071 493,827 4,552
    Cholesky flop count3.9e+008 1.8e+008 1.4e+004
    nnz(L+U), no partial pivoting1,224,874 984,386 22,554
    nnz(V) for QR, upper bound nnz(L) for LU101,534 101,126 6,666
    nnz(R) for QR, upper bound nnz(U) for LU196,682 214,680 25,364

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 6873 explicit zero entries.

    Maintained by Leslie Foster, last updated 24-Apr-2009.

    Entries 5 through 14 in the table of matrix properties and the singular
    value plot were created using SJsingular code. The other plots
    and statistics are produced using utilities from the SuiteSparse package.
    Matrix color plot pictures by cspy, a MATLAB function in the CSparse package.