Matrix: HB/bcsstk18

Description: S STIFFNESS MATRIX - R.E.GINNA NUCLEAR POWER STATION

HB/bcsstk18 graph
(undirected graph drawing)


HB/bcsstk18 dmperm of HB/bcsstk18

  • Home page of the UF Sparse Matrix Collection
  • Matrix group: HB
  • Click here for a description of the HB group.
  • Click here for a list of all matrices
  • Click here for a list of all matrix groups
  • download as a MATLAB mat-file, file size: 853 KB. Use UFget(40) or UFget('HB/bcsstk18') in MATLAB.
  • download in Matrix Market format, file size: 693 KB.
  • download in Rutherford/Boeing format, file size: 592 KB.

    Matrix properties
    number of rows11,948
    number of columns11,948
    nonzeros149,090
    structural full rank?yes
    structural rank11,948
    # of blocks from dmperm792
    # strongly connected comp.792
    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 AMD637,035
    Cholesky flop count1.3e+08
    nnz(L+U), no partial pivoting, with AMD1,262,122
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD1,569,721
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD3,082,282

    SVD-based statistics:
    norm(A)4.2952e+10
    min(svd(A))0.124139
    cond(A)3.46e+11
    rank(A)11,948
    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/bcsstk18 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.