Matrix: FreeFieldTechnologies/mono_500Hz

Description: 3D vibro-acoustic problem, aircraft engine nacelle. M. Gontier

FreeFieldTechnologies/mono_500Hz graph
(undirected graph drawing)

FreeFieldTechnologies/mono_500Hz dmperm of FreeFieldTechnologies/mono_500Hz

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  • download as a MATLAB mat-file, file size: 78 MB. Use UFget(2215) or UFget('FreeFieldTechnologies/mono_500Hz') in MATLAB.
  • download in Matrix Market format, file size: 106 MB.
  • download in Rutherford/Boeing format, file size: 105 MB.

    Matrix properties
    number of rows169,410
    number of columns169,410
    structural full rank?yes
    structural rank169,410
    # of blocks from dmperm2
    # strongly connected comp.2
    explicit zero entries2,492
    nonzero pattern symmetrysymmetric
    numeric value symmetry 82%
    Cholesky candidate?no
    positive definite?no

    authorM. Gontier
    editorT. Davis
    kindacoustics problem
    2D/3D problem?yes


    Free Field Technologies, Mont-Saint Guibert, Belguim (

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD159,387,111
    Cholesky flop count6.1e+11
    nnz(L+U), no partial pivoting, with AMD318,604,812
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD335,777,284
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD775,211,698

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 2492 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.