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See the recommended documentation of this function

# diff

### 呼び出し手順

```y=diff(x)
y=diff(x [,n [,dim]])```

### パラメータ

x

ベクトルまたは行列 (実数, 複素数, 疎行列 または多項式)

n

dim

y

スカラーまたはベクトル

### 説明

`y=diff(x)` は差分関数 y=x(2:\$)-x(1:\$-1)を計算します.

`diff(x,n,dim)` は, 次元`dim`方向の`n` 次 差分関数です.

`diff(x,n,"*")` は diff(x(:),n)と等価です.

`n`のデフォルト値は 1です. `dim` のデフォルト値は `"*"`です.

`dim='r'``dim=1`と 等価で, `dim='c'``dim=2`と等価です.

### 例

```v=(1:8)^3;
diff(v)
diff(v,3)

A=[(1:8)^2
(1:8)^3
(1:8)^4];

diff(A,3,2)

//approximate differentiation
step=0.001
t=0:step:10;
y=sin(t);
dy=diff(sin(t))/step; //approximate differentiation of sine function
norm(dy-cos(t(1:\$-1)),%inf)```

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