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Scilab help >> Scilab > Scilab keywords > empty

# empty

([]) 空行列

### 説明

`[]` は空行列を定義します. この行列は特殊な行列として定義され, 0行0列,すなわち`size([]) =[0,0]`となります. 以下の便利な表記が使用可能です:

`[] * A = A * [] = []`

`[] + A = A + [] = A`

[ [], A] = [A, []] = A `inv([]) =[]`

`det([])=cond([])=rcond([])=1, rank([])=0`

### 例s

```s=poly(0,'s'); A = [s, s+1];
A+[], A*[]
A=rand(2,2); AA=A([],1), size(AA)
svd([])
w=ssrand(2,2,2); wr=[]*w; size(wr), w1=ss2tf(wr), size(w1)```

### 参照

• matrices — Scilab オブジェクト, Scilabの行列
• poly — 多項式を定義する
• string — 文字列に変換
• boolean — Scilab オブジェクト, 論理値(boolean)変数および演算子 & | ~
• rational — Scilab オブジェクト, Scilabの有理数
• syslin — 線形システムを定義する

### Comments

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