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+//intersection of root loci with real axis
+s=%s
+sys=syslin('c',1/(s*(s+3)*(s^2+2*s+2)))
+clf
+evans(sys)
+K=kpure(sys)
+disp(K,"value of K where RL crosses jw axis=")
+p=poly([K 6 8 5 1],'s','coeff')
+x=roots(p)
+x1=clean(x(1,1))
+x2=clean(x(2,1))
+disp(x2,x1,"crossover points on jw axis=") \ No newline at end of file