• 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

  • Matrix: HB/bcsstk07
  • Description: SYMMETRIC STIFFNESS MATRIX, MEDIUM TEST PROBLEM, CONSISTENT MASSES
  • download as a MATLAB mat-file, file size: 27 KB. Use UFget(29) or UFget('HB/bcsstk07') in MATLAB.
  • download in Matrix Market format
  • download in Rutherford/Boeing format

    HB/bcsstk07

    HB/bcsstk07 graph

    Matrix properties
    number of rows420
    number of columns420
    nonzeros7,860
    structural full rank?yes
    structural rank420
    # of blocks from dmperm1
    # strongly connected comp.1
    entries not in dmperm blocks0
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?yes
    positive definite?yes

    authorJ. Lewis
    editorI. Duff, R. Grimes, J. Lewis
    date1982
    kindduplicate structural problem
    2D/3D problem?yes

    Notes:

    duplicate of HB/bcsstk06

    Ordering statistics:AMD METIS
    nnz(chol(P*(A+A'+s*I)*P'))11,345 12,312
    Cholesky flop count4.0e+05 5.0e+05
    nnz(L+U), no partial pivoting22,270 24,204
    nnz(V) for QR, upper bound nnz(L) for LU14,222 13,650
    nnz(R) for QR, upper bound nnz(U) for LU26,279 24,804

    Maintained by Tim Davis, last updated 04-May-2008.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.
    Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.