• 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/stomach
  • Description: S.Norris, Univ. Auckland. 3D electro-physical model of a duodenum
  • download as a MATLAB mat-file, file size: 22 MB. Use UFget(895) or UFget('Norris/stomach') in MATLAB.
  • download in Matrix Market format
  • download in Rutherford/Boeing format

    Norris/stomach

    Norris/stomach graph

    Matrix properties
    number of rows213,360
    number of columns213,360
    nonzeros3,021,648
    structural full rank?yes
    structural rank213,360
    # of blocks from dmperm1
    # strongly connected comp.1
    entries not in dmperm blocks0
    explicit zero entries0
    nonzero pattern symmetry 85%
    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'))57,474,334 39,963,211
    Cholesky flop count5.1e+10 2.3e+10
    nnz(L+U), no partial pivoting114,735,308 79,713,062
    nnz(V) for QR, upper bound nnz(L) for LU110,927,497 69,791,267
    nnz(R) for QR, upper bound nnz(U) for LU205,340,721 133,550,127

    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.