Matrix: HB/bcsstk30

Description: STIFFNESS MATRIX FOR OFF-SHORE GENERATOR PLATFORM (MSC NASTRAN) - PATTER

HB/bcsstk30 graph
(undirected graph drawing)


HB/bcsstk30

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  • Matrix group: HB
  • Click here for a description of the HB group.
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  • download as a MATLAB mat-file, file size: 614 KB. Use UFget(52) or UFget('HB/bcsstk30') in MATLAB.
  • download in Matrix Market format, file size: 2 MB.
  • download in Rutherford/Boeing format, file size: 505 KB.

    Matrix properties
    number of rows28,924
    number of columns28,924
    nonzeros2,043,492
    structural full rank?yes
    structural rank28,924
    # of blocks from dmperm1
    # strongly connected comp.1
    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 AMD3,851,984
    Cholesky flop count9.4e+08
    nnz(L+U), no partial pivoting, with AMD7,675,044
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD9,014,851
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD23,003,982

    SVD-based statistics:
    norm(A)95.3025
    min(svd(A))0
    cond(A)Inf
    rank(A)8,935
    sprank(A)-rank(A)19,989
    null space dimension19,989
    full numerical rank?no
    singular value gap3.96061e+07

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

    HB/bcsstk30 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.