• SJSU Singular Matrix Database
  • Matrix group: Sandia
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  • Matrix: Sandia/fpga_dcop_06
  • Description: Sandia/fpga_dcop_06 circuit simulation matrix. Sandia National Lab.
  • download as a MATLAB mat-file, file size: 52 KB. Use SJget(291) or SJget('Sandia/fpga_dcop_06') in MATLAB.
  • download in Matrix Market format, file size: 61 KB.
  • download in Rutherford/Boeing format, file size: 61 KB.

    Sandia/fpga_dcop_06

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

    Sandia/fpga_dcop_06

    dmperm of Sandia/fpga_dcop_06

    scc of Sandia/fpga_dcop_06

    Matrix properties (click for a legend)  
    number of rows1,220
    number of columns1,220
    structural full rank?yes
    structural rank1,220
    numerical rank 1,208
    dimension of the numerical null space12
    numerical rank / min(size(A))0.99016
    Euclidean norm of A 8.7825
    calculated singular value # 12081.0518e-009
    numerical rank defined using a tolerance
    max(size(A))*eps(norm(A)) =
    2.1672e-012
    calculated singular value # 12091.0767e-012
    gap in the singular values at the numerical rank:
    singular value # 1208 / singular value # 1209
    976.88
    calculated condition number1.3179e+013
    condest1.7984e+013
    nonzeros5,860
    # of blocks from dmperm193
    # strongly connected comp.34
    entries not in dmperm blocks2,310
    explicit zero entries0
    nonzero pattern symmetry 82%
    numeric value symmetry 35%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorR. Hoekstra
    editorT. Davis
    date2003
    kindsubsequent circuit simulation problem
    2D/3D problem?no
    SJid291
    UFid1,060

    Additional fieldssize and type
    bfull 1220-by-1

    Notes:

    next: Sandia/fpga_dcop_07 first: Sandia/fpga_dcop_01
    

    Ordering statistics:AMD METIS DMPERM+
    nnz(chol(P*(A+A'+s*I)*P'))5,505 5,455 2,954
    Cholesky flop count2.7e+004 2.7e+004 7.8e+003
    nnz(L+U), no partial pivoting9,790 9,690 6,998
    nnz(V) for QR, upper bound nnz(L) for LU10,441 12,570 2,519
    nnz(R) for QR, upper bound nnz(U) for LU26,728 27,520 6,622

    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.