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.TH chart 1 "April 1993" "Scilab Group" "Scilab Function"
.so ../sci.an
.SH NAME
chart - Nichols chart
.SH CALLING SEQUENCE
.nf
chart([flags])
chart(gain [,flags])
chart(gain,phase [,flags])
.fi
.SH PARAMETERS
.TP 10
gain
: real vector ( gains (in DB))
.TP 10
phase
: real vector (phases (in degree))
.TP 10
flags
: a list of at most 4 flags list(sup [,leg [,cm [,cphi]]])
.RS
.TP
sup
: 1 indicates superposition on the previous plot
0 no superposition is done
.TP
leg
: 1 indicates that legends are drawn, o: no legends
.TP
cm
: color number (see plot2d) for gain curves
.TP
cphi
: color number (see plot2d) for phase curves
.RE
.SH DESCRIPTION
plot the Nichols'chart.
.LP
The default values for \fVgain\fR and \fVphase\fR are respectively :
.LP
\fV[-12 -8 -6 -5 -4 -3 -2 -1.4 -1 -.5 0.25 0.5 0.7 1 1.4 2 2.3 3 4 5 6 8 12]\fR
.LP
\fV[-(1:10) , -(20:10:160)]\fR
.SH EXAMPLE
.nf
s=poly(0,'s')
h=syslin('c',(s^2+2*0.9*10*s+100)/(s^2+2*0.3*10.1*s+102.01))
black(h,0.01,100,'(s^2+2*0.9*10*s+100)/(s^2+2*0.3*10.1*s+102.01)')
chart(list(1,0,2,3));
.fi
Another example :
.nf
xbasc()
h1=h*syslin('c',(s^2+2*0.1*15.1*s+228.01)/(s^2+2*0.9*15*s+225))
black([h1;h],0.01,100,['h1';'h'])
chart([-8 -6 -4],[80 120],list(1,0));
.fi
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