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11 Example 5.13 Ogata 4edition (Routh's stability criterion)



    Let us calculate Routh by Scilab.

    \begin{displaymath}s^{4}+2\cdot s^{3}+3\cdot s^{2}+4\cdot s+5\end{displaymath}

    Program in Scilab: 
    h=poly([5 4 3 2 1],'s','coeff');

r=routh_t(h)
    Result 
    -->r
 r  =
 
    1.    3.    5.  
    2.    4.    0.  
    1.    5.    0.  
  - 6.    0.    0.  
    5.    0.    0.

    Changes sign in the first column, unstable