File: p_margin.cat

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p_margin          Scilab Group          Scilab Function            p_margin
NAME
   p_margin - phase margin
  
CALLING SEQUENCE
 [phm,fr]=p_margin(h)
 phm=p_margin(h)
PARAMETERS
 h          : SISO linear system (syslin list).
            
 phm        : phase margin (in degree)
            
 fr         : corresponding frequency (hz)
            
DESCRIPTION
   The phase margin is the values of the phase at points where the nyquist
  plot of h crosses the unit circle.
  
EXAMPLE
 h=syslin('c',-1+%s,3+2*%s+%s^2)
 [p,fr]=p_margin(h)  
 [p,fr]=p_margin(h+0.7)  
 nyquist(h+0.7)
 t=(0:0.1:2*%pi)';plot2d(sin(t),cos(t),-3,'000')
SEE ALSO
   chart, black, g_margin, nyquist
  
AUTHOR
   S. S.