Matrix: Schenk_ISEI/para-4

Description: Olaf Schenk, Univ. Basel: Integrated Systems Eng., San Jose, semiconductor device

Schenk_ISEI/para-4 graph
(undirected graph drawing)

Schenk_ISEI/para-4

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  • Matrix group: Schenk_ISEI
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  • download as a MATLAB mat-file, file size: 27 MB. Use UFget(973) or UFget('Schenk_ISEI/para-4') in MATLAB.
  • download in Matrix Market format, file size: 31 MB.
  • download in Rutherford/Boeing format, file size: 27 MB.

    Matrix properties
    number of rows153,226
    number of columns153,226
    nonzeros2,930,882
    structural full rank?yes
    structural rank153,226
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries2,395,346
    nonzero pattern symmetrysymmetric
    numeric value symmetry 29%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorIntegrated Sys. Eng.
    editorO. Schenk
    date2003
    kindsemiconductor device problem
    2D/3D problem?yes

    Additional fieldssize and type
    bfull 153226-by-1

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD206,759,325
    Cholesky flop count8.6e+11
    nnz(L+U), no partial pivoting, with AMD413,365,424
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD649,970,724
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD1,076,021,512

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 2395346 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.