Matrix: HB/bcsstk32

Description: STIFFNESS MATRIX FOR AUTOMOBILE CHASSIS (MSC NASTRAN) - PATTERN ONLY

HB/bcsstk32 graph
(undirected graph drawing)

HB/bcsstk32

  • 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: 653 KB. Use UFget(54) or UFget('HB/bcsstk32') in MATLAB.
  • download in Matrix Market format, file size: 2 MB.
  • download in Rutherford/Boeing format, file size: 629 KB.

    Matrix properties
    number of rows44,609
    number of columns44,609
    nonzeros2,014,701
    structural full rank?yes
    structural rank44,609
    # 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 AMD4,988,735
    Cholesky flop count9.5e+08
    nnz(L+U), no partial pivoting, with AMD9,932,861
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD14,950,031
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD30,560,536

    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.