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Справка Scilab >> CACSD > Plot and display > chart

# chart

Nichols chart. This function is obsolete.

### Calling Sequence

```chart([flags])
chart(gain [,flags])
chart(gain,phase [,flags])```

### Arguments

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 index for gain curves

cphi

color index for phase curves

### Description

plot the Nichols'chart: iso-gain and iso-phase contour of y/(1+y) in phase/gain plane

`chart` may be used in cunjunction with black.

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)]`

 This function is obsolete.
It is better to use nicholschart instead of `chart`.

### Examples

```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)
chart(list(1,0,2,3));

clf()
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'])
set(gca(),'data_bounds',[-180 -30;180 30]) //enlarge the frame
chart(list(1,0));```

### History

 Версия Описание 5.5.0 Function tagged as obsolete. Will be removed in 5.5.1. Please use nicholschart instead.