• UF Sparse Matrix Collection
  • Matrix group: Norris
  • Click here for a description of the Norris group.
  • Click here for a list of all matrices
  • Click here for a list of all matrix groups

  • Matrix: Norris/torso3
  • Description: S.Norris, Univ Auckland. finite diff. electro-phys. 3D model of torso
  • download as a MATLAB mat-file, file size: 32 MB. Use UFget(898) or UFget('Norris/torso3') in MATLAB.
  • download in Matrix Market format
  • download in Rutherford/Boeing format

    Norris/torso3

    Norris/torso3 graph

    Matrix properties
    number of rows259,156
    number of columns259,156
    nonzeros4,429,042
    structural full rank?yes
    structural rank259,156
    # of blocks from dmperm1
    # strongly connected comp.1
    entries not in dmperm blocks0
    explicit zero entries0
    nonzero pattern symmetry 95%
    numeric value symmetry 0%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorS. Norris
    editorT. Davis
    date2003
    kind2D/3D problem
    2D/3D problem?yes

    Ordering statistics:AMD METIS
    nnz(chol(P*(A+A'+s*I)*P'))376,330,798 111,548,581
    Cholesky flop count2.0e+12 1.7e+11
    nnz(L+U), no partial pivoting752,402,440 222,838,006
    nnz(V) for QR, upper bound nnz(L) for LU467,921,933 203,084,057
    nnz(R) for QR, upper bound nnz(U) for LU831,867,752 379,483,284

    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.