Bode/Root Locus/Nyquist/Nichols...App{update 16JAN2018}

[toshk]

1/(s^4+16*s^3+65*s^2+50*s)
fixed issues:    

S1 plot the phase;    

S2 plot to unwrap the phase;    

RootLocus;    


RootLocus with assign Gain; (G:=10000)