Matrix: Morandini/rotor2

Description: Marco Morandini, large helicoptor rotor model

Morandini/rotor2 graph Morandini/rotor2 graph
(bipartite graph drawing) (graph drawing of A+A')

Morandini/rotor2 dmperm of Morandini/rotor2
scc of Morandini/rotor2

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  • Matrix group: Morandini
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  • download as a MATLAB mat-file, file size: 55 KB. Use UFget(1327) or UFget('Morandini/rotor2') in MATLAB.
  • download in Matrix Market format, file size: 61 KB.
  • download in Rutherford/Boeing format, file size: 47 KB.

    Matrix properties
    number of rows791
    number of columns791
    structural full rank?yes
    structural rank791
    # of blocks from dmperm36
    # strongly connected comp.7
    explicit zero entries0
    nonzero pattern symmetry 23%
    numeric value symmetry 12%
    Cholesky candidate?no
    positive definite?no

    authorM. Morandini
    editorT. Davis
    kindstructural problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD15,487
    Cholesky flop count3.4e+05
    nnz(L+U), no partial pivoting, with AMD30,183
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD9,022
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD23,749

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

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

    Morandini/rotor2 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.