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Scilab help >> Differential Equations, Integration > diff

diff

差分および離散微分

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

整数,差分の次数

dim

整数または"r","c" および "*"を値とする文字列

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.

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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Last updated:
Mon Oct 01 17:40:22 CEST 2012