Matrix: Norris/torso3

Description: S.Norris, Univ Auckland. finite diff. electro-phys. 3D model of torso

Norris/torso3 graph Norris/torso3 graph
(bipartite graph drawing) (graph drawing of A+A')

Norris/torso3

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  • Matrix group: Norris
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  • download as a MATLAB mat-file, file size: 32 MB. Use UFget(898) or UFget('Norris/torso3') in MATLAB.
  • download in Matrix Market format, file size: 47 MB.
  • download in Rutherford/Boeing format, file size: 41 MB.

    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
    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:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD376,330,798
    Cholesky flop count2.0e+12
    nnz(L+U), no partial pivoting, with AMD752,402,440
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD467,921,933
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD831,867,752

    For a description of the statistics displayed above, click here.

    Maintained by Tim Davis, last updated 12-Mar-2014.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.
    Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.