Matrix: FEMLAB/sme3Db

Description: Comsol, Inc. www.femlab.com : 3D structural mechanics problem

FEMLAB/sme3Db graph FEMLAB/sme3Db graph
(bipartite graph drawing) (graph drawing of A+A')


FEMLAB/sme3Db

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  • Matrix group: FEMLAB
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  • download as a MATLAB mat-file, file size: 19 MB. Use UFget(931) or UFget('FEMLAB/sme3Db') in MATLAB.
  • download in Matrix Market format, file size: 27 MB.
  • download in Rutherford/Boeing format, file size: 25 MB.

    Matrix properties
    number of rows29,067
    number of columns29,067
    nonzeros2,081,063
    structural full rank?yes
    structural rank29,067
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetry 100%
    numeric value symmetry 44%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorCOMSOL
    editorT. Davis
    date2003
    kindstructural problem
    2D/3D problem?yes

    Additional fieldssize and type
    bfull 29067-by-1

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD7,184,217
    Cholesky flop count3.5e+09
    nnz(L+U), no partial pivoting, with AMD14,339,367
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD14,043,866
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD36,017,823

    SVD-based statistics:
    norm(A)79934.6
    min(svd(A))0.00220106
    cond(A)3.63164e+07
    rank(A)29,067
    sprank(A)-rank(A)0
    null space dimension0
    full numerical rank?yes

    singular values (MAT file):click here
    SVD method used:s = svd (full (A))
    status:ok

    FEMLAB/sme3Db svd

    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.