GetModes:

Path: SC/Attitude

% Extract flex modes from a finite element modal transformation matrix.
   The transformation matrix Phi is organized as
      [3-by-nNodes mode 1,3-by-nNodes mode 2,...]

   Since version 1.
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   Form:
   [phiTrunc, omega] = GetModes( phi, omega, useModes, nNodes )
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   ------
   Inputs
   ------
   phi              (3,n*m) Nodal displacements per modal displacement
   omega            (m)     Modal frequencies
   useModes         (1,:)   Modes to use
   nNodes           (1,1)   Number of nodes
   

   -------
   Outputs
   -------
   phiTrunc         (3,n*:) Nodal displacements per modal displacement
   omega            (m)     Modal frequencies

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