• 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/lung2
  • Description: S.Norris, Univ. Auckland. Coupled temp,water vapour transport in lung
  • download as a MATLAB mat-file, file size: 3 MB. Use UFget(894) or UFget('Norris/lung2') in MATLAB.
  • download in Matrix Market format
  • download in Rutherford/Boeing format

    Norris/lung2

    dmperm of Norris/lung2

    Norris/lung2 graph

    Matrix properties
    number of rows109,460
    number of columns109,460
    nonzeros492,564
    structural full rank?yes
    structural rank109,460
    # of blocks from dmperm2
    # strongly connected comp.2
    entries not in dmperm blocks164,188
    explicit zero entries0
    nonzero pattern symmetry 57%
    numeric value symmetry 0%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorS. Norris
    editorT. Davis
    date2003
    kindcomputational fluid dynamics problem
    2D/3D problem?yes

    Ordering statistics:AMD METIS DMPERM+
    nnz(chol(P*(A+A'+s*I)*P'))383,106 454,138 218,918
    Cholesky flop count1.4e+06 2.2e+06 4.4e+05
    nnz(L+U), no partial pivoting656,752 798,816 492,564
    nnz(V) for QR, upper bound nnz(L) for LU346,634 374,417 218,918
    nnz(R) for QR, upper bound nnz(U) for LU701,118 709,950 525,620

    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.