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+//Example 7.14
+//Analysis of state equations of Tape Drive.
+//compute the poles, zeros  and transfer function of Tape Drive System.
+
+xdel(winsid())//close all graphics Windows
+clear;
+clc;
+//------------------------------------------------------------------
+// State space matrices of Tape Drive System
+
+F=[0 2 0 0 0;
+-0.1 -0.35 0.1 0.1 0.75;
+0 0 0 2 0;
+0.4 0.4 -0.4 -1.4 0;
+0 -0.03 0 0 -1];
+G=[0 0 0 0 1]';
+H2=[0 0 1 0 0];
+H3=[0.5 0 0.5 0 0];
+Ht=[-0.2 -0.2 0.2 0.2 0];
+//------------------------------------------------------------------
+//Poles (eigen values) of the system
+p=clean(spec(F));
+
+disp(p,"P","Poles of Tape Drive System are (for any output)")
+disp("************************************************************")
+
+
+disp("pole and zero polynomials and transfer function...
+ for a system with output H2")
+sys2=syslin('c',F,G,H2,0);
+[d2 num2 den2]=ss2tf(sys2);
+N2=coeff(num2);
+D2=coeff(den2);
+disp(D2,"D2",N2,"N2")
+// zeros of the system with output H2
+[zer2]=trzeros(sys2)
+disp(zer2,"ZER2","zeros are")
+// transfer function of the system with output H2
+G2=clean(num2/den2);
+disp(G2,"G2(s)=N2(s)/D2(s)=")
+disp("************************************************************")
+
+disp("pole and zero polynomials and transfer function for a...
+ system with output H3")
+sys3=syslin('c',F,G,H3,0);
+[d3 num3 den3]=ss2tf(sys3);
+N3=coeff(num3);
+D3=coeff(den3);
+disp(D3,"D3",N3,"N3")
+// zeros of the system with output H3
+[zer3]=trzeros(sys3)
+disp(zer3,"ZER3","zeros are")
+// transfer function of the system with output H3
+G3=clean(num2/den2);
+disp(G3,"G3(s)=N3(s)/D3(s)=")
+disp("************************************************************")
+
+
+disp("pole and zero polynomials and transfer function for a...
+ system with output Ht")
+syst=syslin('c',F,G,Ht,0);
+[dt numt dent]=ss2tf(syst);
+Nt=coeff(numt);
+Dt=coeff(dent);
+disp(Dt,"Dt",Nt,"Nt","zeros are")
+// zeros of the system with output Ht
+[zert]=trzeros(syst)
+disp(zert,"ZERT")
+// transfer function of the system with output Ht
+Gt=clean(numt/dent);
+disp(Gt,"G(s)=Nt(s)/Dt(s)=")
+disp("************************************************************")
+//------------------------------------------------------------------
+