Matrix: HB/bcsstk15

Description: S STIFFNESS MATRIX - MODULE OF AN OFFSHORE PLATFORM

HB/bcsstk15 graph
(undirected graph drawing)


HB/bcsstk15 dmperm of HB/bcsstk15

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  • Matrix group: HB
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  • download as a MATLAB mat-file, file size: 364 KB. Use UFget(37) or UFget('HB/bcsstk15') in MATLAB.
  • download in Matrix Market format, file size: 350 KB.
  • download in Rutherford/Boeing format, file size: 213 KB.

    Matrix properties
    number of rows3,948
    number of columns3,948
    nonzeros117,816
    structural full rank?yes
    structural rank3,948
    # of blocks from dmperm7
    # strongly connected comp.7
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?yes
    positive definite?yes

    authorM. Will
    editorI. Duff, R. Grimes, J. Lewis
    date1985
    kindstructural problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD614,590
    Cholesky flop count1.5e+08
    nnz(L+U), no partial pivoting, with AMD1,225,232
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD769,373
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD1,449,877

    SVD-based statistics:
    norm(A)6.53818e+09
    min(svd(A))1
    cond(A)6.53819e+09
    rank(A)3,948
    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

    HB/bcsstk15 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.