initial commit / add all books

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+//Example 24.1

+clc

+syms K b z w;

+Gz=K*(1-b)/(z-b)

+//where b=exp(-T/tau)

+//From Eq.(24.4)

+z=w+1/w-1;

+Gz=eval(Gz)

+disp('=0',1+Gz,'1+G(z)=')

+//which is equivalent to

+disp('(K+1)*(1-b)*w+(1+b)-K(1-b)=0')

+routh=[(K+1)*(1-b);(1+b)-K*(1-b)]

+//b is always positive and less than one and K is positive

+//The first element in the array is positive

+//For stability, the Routh test requires that all elements of the first column be positive

+//Therefore,

+disp('>0',routh(2,1))

+disp('K<(1+b)/(1-b)')

+