Matrix: Oberwolfach/boneS01

Description: Oberwolfach: 3D trabecular bone

Oberwolfach/boneS01 graph
(undirected graph drawing)


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  • Matrix group: Oberwolfach
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  • download as a MATLAB mat-file, file size: 13 MB. Use UFget(1454) or UFget('Oberwolfach/boneS01') in MATLAB.
  • download in Matrix Market format, file size: 17 MB.
  • download in Rutherford/Boeing format, file size: 8 MB.

    Matrix properties
    number of rows127,224
    number of columns127,224
    structural full rank?yes
    structural rank127,224
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries1,198,550
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    Cholesky candidate?yes
    positive definite?yes

    authorB. van Rietbergen, E. Rudnyi, J. Korvink
    editorE. Rudnyi
    kindmodel reduction problem
    2D/3D problem?yes

    Additional fieldssize and type
    Msparse 127224-by-127224
    Bsparse 127224-by-1
    Csparse 3-by-127224
    cnamefull 3-by-8


    Primary matrix in this model reduction problem is the Oberwolfach K matrix

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD59,350,868
    Cholesky flop count1.3e+11
    nnz(L+U), no partial pivoting, with AMD118,574,512
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD129,340,795
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD255,285,585

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 1198550 explicit zero entries.

    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.