Matrix: Schenk_AFE/af_shell8

Description: Olaf Schenk, Univ. Basel: AutoForm Eng. GmbH, Zurich. sheet metal forming. positive definite

Schenk_AFE/af_shell8 graph
(undirected graph drawing)


Schenk_AFE/af_shell8

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  • Matrix group: Schenk_AFE
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  • download as a MATLAB mat-file, file size: 35 MB. Use UFget(947) or UFget('Schenk_AFE/af_shell8') in MATLAB.
  • download in Matrix Market format, file size: 43 MB.
  • download in Rutherford/Boeing format, file size: 20 MB.

    Matrix properties
    number of rows504,855
    number of columns504,855
    nonzeros17,579,155
    structural full rank?yes
    structural rank504,855
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries9,720
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?yes
    positive definite?yes

    authorAutoForm Eng.
    editorO. Schenk
    date2003
    kindsubsequent structural problem
    2D/3D problem?yes

    Additional fieldssize and type
    bfull 504855-by-1

    Notes:

    next: Schenk_AFE/af_shell9 first: Schenk_AFE/af_shell1
    

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD103,109,384
    Cholesky flop count6.8e+10
    nnz(L+U), no partial pivoting, with AMD205,713,913
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD211,044,595
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD411,101,115

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 9720 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.