File: p_margin.man

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.TH p_margin 1 "April 1993" "Scilab Group" "Scilab Function"
.so ../sci.an 
.SH NAME
p_margin - phase margin
.SH CALLING SEQUENCE
.nf
[phm,fr]=p_margin(h)
phm=p_margin(h)
.fi
.SH PARAMETERS
.TP 10
h   
: SISO linear system (\fVsyslin\fR list).
.TP
phm 
: phase margin (in degree)
.TP
fr  
: corresponding frequency (hz)
.SH DESCRIPTION
The phase margin is the values of the phase at points where the
nyquist plot of \fVh\fR crosses the unit circle.
.SH EXAMPLE
.nf
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')
.fi
.SH SEE ALSO 
chart, black, g_margin, nyquist
.SH AUTHOR
S. S.