Matrix: Boeing/bcsstm34

Description: NASTRAN BUCKLING PROBLEM, DIFFERENTIAL STIFFNESS MATRIX

Boeing/bcsstm34 graph
(undirected graph drawing)


Boeing/bcsstm34

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  • Matrix group: Boeing
  • Click here for a description of the Boeing group.
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  • download as a MATLAB mat-file, file size: 148 KB. Use UFget(344) or UFget('Boeing/bcsstm34') in MATLAB.
  • download in Matrix Market format, file size: 93 KB.
  • download in Rutherford/Boeing format, file size: 75 KB.

    Matrix properties
    number of rows588
    number of columns588
    nonzeros24,270
    structural full rank?yes
    structural rank588
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?no
    positive definite?no

    authorR. Grimes
    editorT. Davis
    date1995
    kindstructural problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD45,404
    Cholesky flop count4.5e+06
    nnz(L+U), no partial pivoting, with AMD90,220
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD40,616
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD71,894

    SVD-based statistics:
    norm(A)6.83308
    min(svd(A))6.02874e-06
    cond(A)1.13342e+06
    rank(A)588
    sprank(A)-rank(A)0
    null space dimension0
    full numerical rank?yes

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

    Boeing/bcsstm34 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.