• 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/bcsstk04
  • Description: SYMMETRIC STIFFNESS MATRIX, OIL RIG, NOT CONDENSED (SAME MODEL AS X02)
  • download as a MATLAB mat-file, file size: 10 KB. Use UFget(26) or UFget('HB/bcsstk04') in MATLAB.
  • download in Matrix Market format
  • download in Rutherford/Boeing format

    HB/bcsstk04

    HB/bcsstk04 graph

    Matrix properties
    number of rows132
    number of columns132
    nonzeros3,648
    structural full rank?yes
    structural rank132
    # 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
    kindstructural problem
    2D/3D problem?yes

    Ordering statistics:AMD METIS
    nnz(chol(P*(A+A'+s*I)*P'))3,293 3,646
    Cholesky flop count9.1e+04 1.2e+05
    nnz(L+U), no partial pivoting6,454 7,160
    nnz(V) for QR, upper bound nnz(L) for LU3,801 4,755
    nnz(R) for QR, upper bound nnz(U) for LU6,222 7,043

    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.