• SJSU Singular Matrix Database
  • Matrix group: Sandia
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  • Matrix: Sandia/oscil_dcop_21
  • Description: Sandia/oscil_dcop_21 circuit simulation matrix. Sandia National Lab.
  • download as a MATLAB mat-file, file size: 13 KB. Use SJget(170) or SJget('Sandia/oscil_dcop_21') in MATLAB.
  • download in Matrix Market format, file size: 15 KB.
  • download in Rutherford/Boeing format, file size: 14 KB.

    Sandia/oscil_dcop_21

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

    Sandia/oscil_dcop_21

    dmperm of Sandia/oscil_dcop_21

    scc of Sandia/oscil_dcop_21

    Matrix properties (click for a legend)  
    number of rows430
    number of columns430
    structural full rank?yes
    structural rank430
    numerical rank 427
    dimension of the numerical null space3
    numerical rank / min(size(A))0.99302
    Euclidean norm of A 2.001e+006
    calculated singular value # 4271.276e-007
    numerical rank defined using a tolerance
    max(size(A))*eps(norm(A)) =
    1.0012e-007
    calculated singular value # 4281.1173e-008
    gap in the singular values at the numerical rank:
    singular value # 427 / singular value # 428
    11.421
    calculated condition number2.2838e+014
    condest2.9261e+014
    nonzeros1,544
    # of blocks from dmperm31
    # strongly connected comp.9
    entries not in dmperm blocks62
    explicit zero entries0
    nonzero pattern symmetry 98%
    numeric value symmetry 70%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorR. Hoekstra
    editorT. Davis
    date2003
    kindsubsequent circuit simulation problem
    2D/3D problem?no
    SJid170
    UFid1,132

    Additional fieldssize and type
    bfull 430-by-1

    Notes:

    next: Sandia/oscil_dcop_22 first: Sandia/oscil_dcop_01
    

    Ordering statistics:AMD METIS DMPERM+
    nnz(chol(P*(A+A'+s*I)*P'))1,439 1,546 1,455
    Cholesky flop count5.2e+003 6.2e+003 5.6e+003
    nnz(L+U), no partial pivoting2,448 2,662 2,542
    nnz(V) for QR, upper bound nnz(L) for LU1,830 1,928 1,777
    nnz(R) for QR, upper bound nnz(U) for LU3,504 3,832 3,076

    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.