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Scilabヘルプ >> Elementary Functions > elementarymatrices > random > noisegen

# noisegen

ノイズ生成 (obsolete)

### 呼び出し手順

`b=noisegen(pas,Tmax,sig)`

### 説明

 `noisegen()` is obsolete. It will be removed from Scilab 6.1.x. Please use grand() instead. Examples (clearer, shorter, and more powerful) follow: 100 10-point wide steps with random amplitudes of normal distribution of mean 1 and standard deviation 0.7: ```u = grand(1,100,"nor",1,0.7) .*. ones(1,10); clf, plot(u);``` 40 15-point wide steps with random amplitudes of uniform distribution in [1 3], with initial level 0.5 and final level hold: ```width = 15; u = grand(1,40, "unf", 1, 3) .*. ones(1,width); u = [ones(1,8*width)*0.5, u, ones(1,5*width)*u(\$)]; clf, plot(u);```

Scilab 関数 `[b]=Noise(t)`を生成します. ただし, `Noise(t)`は区分定数関数です (`[k*pas,(k+1)*pas]`の区間は定数). 各一定区間の値は, 互いに独立で同一の分布に従う標準偏差 sig のガウス分布 によるランダムな値です. 関数は,`t<=0`および `t>=Tmax`では一定です.

### 例

```noisegen(0.5,30,1.0);
x=-5:0.01:35;
y=feval(x,Noise);
plot(x,y);```

### 履歴

 バージョン 記述 6.1.0 noisegen() is obsolete. It will be removed from Scilab 6.1.x. Please replace it with grand() and .*.