Matrix: HB/bcsstk26

Description: SYMMETRIC STIFFNESS MATRIX - REACTOR CONTAINMENT FLOOR -- SECTION

HB/bcsstk26 graph
(undirected graph drawing)


HB/bcsstk26

  • Home page of the UF Sparse Matrix Collection
  • Matrix group: HB
  • Click here for a description of the HB group.
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  • download as a MATLAB mat-file, file size: 182 KB. Use UFget(48) or UFget('HB/bcsstk26') in MATLAB.
  • download in Matrix Market format, file size: 154 KB.
  • download in Rutherford/Boeing format, file size: 134 KB.

    Matrix properties
    number of rows1,922
    number of columns1,922
    nonzeros30,336
    structural full rank?yes
    structural rank1,922
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?yes
    positive definite?yes

    authorA. Mera, R. Cigel, J. Lewis
    editorI. Duff, R. Grimes, J. Lewis
    date1984
    kindstructural problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD42,348
    Cholesky flop count1.5e+06
    nnz(L+U), no partial pivoting, with AMD82,774
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD87,631
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD172,585

    SVD-based statistics:
    norm(A)1.58273e+11
    min(svd(A))953.833
    cond(A)1.65934e+08
    rank(A)1,922
    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/bcsstk26 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.