Matrix: DNVS/ship_001

Description: DNV-Ex 2 : Ship structure, predesign model-1999-01-17

DNVS/ship_001 graph
(undirected graph drawing)


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  • Matrix group: DNVS
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  • download as a MATLAB mat-file, file size: 27 MB. Use UFget(1277) or UFget('DNVS/ship_001') in MATLAB.
  • download in Matrix Market format, file size: 22 MB.
  • download in Rutherford/Boeing format, file size: 19 MB.

    Matrix properties
    number of rows34,920
    number of columns34,920
    structural full rank?yes
    structural rank34,920
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries747,734
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    Cholesky candidate?yes
    positive definite?yes

    authorC. Damhaug
    editorJ. Koster
    kindstructural problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD16,410,406
    Cholesky flop count1.2e+10
    nnz(L+U), no partial pivoting, with AMD32,785,892
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD20,435,201
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD47,931,029

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 747734 explicit zero entries.

    SVD-based statistics:
    null space dimension32
    full numerical rank?no
    singular value gap1.08248

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

    DNVS/ship_001 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.