Matrix: HB/bcsstk29

Description: S STIFFNESS MATRIX FOR BUCKLING MODEL OF THE 767 REAR BULKHEAD - PATTER

HB/bcsstk29 graph
(undirected graph drawing)


HB/bcsstk29 dmperm of HB/bcsstk29

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  • Matrix group: HB
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  • download as a MATLAB mat-file, file size: 235 KB. Use UFget(51) or UFget('HB/bcsstk29') in MATLAB.
  • download in Matrix Market format, file size: 628 KB.
  • download in Rutherford/Boeing format, file size: 222 KB.

    Matrix properties
    number of rows13,992
    number of columns13,992
    nonzeros619,488
    structural full rank?yes
    structural rank13,992
    # of blocks from dmperm28
    # strongly connected comp.28
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typebinary
    structuresymmetric
    Cholesky candidate?yes
    positive definite?no

    authorR. Cigel, R. Grimes, J. Lewis, E. Meyer
    editorI. Duff, R. Grimes, J. Lewis
    date1986
    kindstructural problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD1,785,692
    Cholesky flop count4.7e+08
    nnz(L+U), no partial pivoting, with AMD3,557,392
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD3,045,985
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD6,149,099

    SVD-based statistics:
    norm(A)51.737
    min(svd(A))7.2798e-74
    cond(A)7.10693e+74
    rank(A)10,006
    sprank(A)-rank(A)3,986
    null space dimension3,986
    full numerical rank?no
    singular value gap4.49854e+08

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

    HB/bcsstk29 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.