Matrix: TKK/plbuckle

Description: Double eigenvalue plate buckling; stiffness matrix K and initial stress G

TKK/plbuckle graph
(undirected graph drawing)

TKK/plbuckle dmperm of TKK/plbuckle

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  • Matrix group: TKK
  • Click here for a description of the TKK group.
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  • download as a MATLAB mat-file, file size: 124 KB. Use UFget(1911) or UFget('TKK/plbuckle') in MATLAB.
  • download in Matrix Market format, file size: 140 KB.
  • download in Rutherford/Boeing format, file size: 99 KB.

    Matrix properties
    number of rows1,282
    number of columns1,282
    structural full rank?yes
    structural rank1,282
    # of blocks from dmperm2
    # strongly connected comp.2
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    Cholesky candidate?yes
    positive definite?yes

    authorR. Kouhia
    editorT. Davis
    kindstructural problem
    2D/3D problem?yes

    Additional fieldssize and type
    Gsparse 1282-by-1282


    Matrix problems from Reijo Kouhia, Structural Mechanics, Helsinki  
    University of Technology.

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD43,827
    Cholesky flop count1.8e+06
    nnz(L+U), no partial pivoting, with AMD86,372
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD44,989
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD85,500

    SVD-based statistics:
    null space dimension0
    full numerical rank?yes

    singular values (MAT file):click here
    SVD method used:s = svd (full (A)) ;

    TKK/plbuckle svd

    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.