… In a normal function table, the variables …, x 0 , x 1 , x 2 , … are spaced at equal intervals. In this case, a difference table is used to calculate as follows. First, the first-order difference of the function value f i = f ( x i ), ⊿ i f ≡ ⊿ i 1 f = f i +1 - f i , the second-order difference ⊿ i 2 f = ⊿ i +1 1 f - ⊿ i 1 f , …, and generally the n- th order difference ⊿ i n f = ⊿ i +1 n -1 f - ⊿ i n -1 f are successively defined. … *Some of the terminology explanations that refer to "difference tables" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… ふつうの関数表では変数……,x0,x1,x2,……は等間隔に配置されている。このときには,階差表を使って次のように計算される。まず関数値fi=f(xi)の1階差分⊿if≡⊿i1f=fi+1-fi,2階差分⊿i2f=⊿i+11f-⊿i1f,……,一般にn階差分⊿inf=⊿i+1n-1f-⊿in-1fを逐次定義する。… ※「階差表」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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