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chart Scilab Group Scilab Function chart
NAME
chart - Nichols chart
CALLING SEQUENCE
chart([flags])
chart(gain [,flags])
chart(gain,phase [,flags])
PARAMETERS
gain : real vector ( gains (in DB))
phase : real vector (phases (in degree))
flags : a list of at most 4 flags list(sup [,leg [,cm [,cphi]]])
sup : 1 indicates superposition on the previous plot 0 no
superposition is done
leg : 1 indicates that legends are drawn, o: no legends
cm : color number (see plot2d) for gain curves
cphi : color number (see plot2d) for phase curves
DESCRIPTION
plot the Nichols'chart.
The default values for gain and phase are respectively :
[-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]
[-(1:10) , -(20:10:160)]
EXAMPLE
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));
Another example :
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));
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