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Scilabヘルプ >> CACSD > nyquistfrequencybounds

# nyquistfrequencybounds

ナイキスト軌跡が指定した矩形に入る周波数および出る周波数を計算する.

### 呼び出し手順

`[fmin,fmax] = nyquistfrequencybounds(H,bounds)`

### パラメータ

H

SISO線形動的システム.

bounds

2行2列配列:複素平面の矩形を定義する配列 [Rmin Imin;Rmax Imax] .

fmin

fmax

### 説明

この関数はナイキスト軌跡の高解像度の拡大図を作成する用途では有用です.

### 例

```s=%s
num=2+9*s-9*s^2-11*s^3+0.01*s^4;
den=43*s^2+65*s^3+34*s^4+8*s^5+s^6+0.1*s^7
H=syslin('c',num,den)-1
clf;set(gcf(),'axes_size',[805,549])
subplot(221)
nyquist(H)
subplot(222)
bounds=[-2 -2;2 2]
[fmin,fmax]=nyquistfrequencybounds(H,bounds)
nyquist(H,fmin,fmax)
title("bounds:"+sci2exp(bounds,0));
subplot(223)
bounds=[-1.3 -0.3;0 0.3]
[fmin,fmax]=nyquistfrequencybounds(H,bounds)
nyquist(H,fmin,fmax)
title("bounds:"+sci2exp(bounds,0));
subplot(224)
bounds=[-1.1 -0.1;-0.8 0.1]
[fmin,fmax]=nyquistfrequencybounds(H,bounds)
nyquist(H,fmin,1d8)
title("bounds:"+sci2exp(bounds,0));```