//control systems by Nagoor Kani A //Edition 3 //Year of publication 2015 //Scilab version 6.0.0 //operating systems windows 10 // Example 5.13 clc; clear; s=poly(0,'s')//defines s as poly nomial variable h=syslin('c',(230/(s*(s+2)*(s+10))))//the value of K lies between 0 to 240 .the given transfer function assigned to variable h nyquist(h) show_margins(h,'nyquist') //calculation of K //when -0.00417K=-1the contour passes through -1+j0 and the corrospondig value of K is the limiting value of k for stabilty K=1/0.00417 disp(K,'the value of K is')