Matrix: Oberwolfach/LFAT5

Description: Oberwolfach: linear 1D beam

Oberwolfach/LFAT5 graph
(undirected graph drawing)

Oberwolfach/LFAT5 dmperm of Oberwolfach/LFAT5

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  • Matrix group: Oberwolfach
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  • download as a MATLAB mat-file, file size: 999 bytes. Use UFget(1440) or UFget('Oberwolfach/LFAT5') in MATLAB.
  • download in Matrix Market format, file size: 1 KB.
  • download in Rutherford/Boeing format, file size: 1 KB.

    Matrix properties
    number of rows14
    number of columns14
    structural full rank?yes
    structural rank14
    # of blocks from dmperm3
    # strongly connected comp.3
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    Cholesky candidate?yes
    positive definite?yes

    authorJ. Lienemann, A. Greiner, J. Korvink
    editorE. Rudnyi
    kindmodel reduction problem
    2D/3D problem?yes

    Additional fieldssize and type
    Msparse 14-by-14
    Esparse 14-by-14
    Bsparse 14-by-1
    Csparse 1-by-14


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

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD33
    Cholesky flop count9.1e+01
    nnz(L+U), no partial pivoting, with AMD52
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD33
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD43

    SVD-based statistics:
    null space dimension0
    full numerical rank?yes

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

    Oberwolfach/LFAT5 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.