A method of numerically approximating the definite integral (equation 1) of a function f(x) from x = a to b. In the simplest case, if the interval [a, b] is divided into n equal parts (the length of each section is h = (b - a)/n), and the subdivisions are a = x(/0), x 1 , ..., x(/n)(/-) 1 , x(/n) = b, and the values of the function y = f(x) at each subdivision are y(/0), y 1 , ..., y(/n), then I ≒ h {(y(/0) + y(/n))/ 2 + y 1 + y 2 + ... + y(/n)(/-) 1 } (trapezoidal rule). The most commonly used is Simpson's rule, but others include Chebyshev's rule and Gauss's rule. →Numerical calculation methods / Numerical control machine tools / Numerical forecasting Source : Heibonsha Encyclopedia About MyPedia Information |
関数f(x)のx=aからbまでの定積分(式1)の近似値を数値計算により求める方法。最も簡単には,区間[a,b]をn等分し(各区分の長さh=(b−a)/n),各分点をa=x(/0),x1,…,x(/n)(/-)1,x(/n)=b,各分点における関数y=f(x)の値をy(/0),y1,…,y(/n)としたときI≒h{(y(/0)+y(/n))/2+y1+y2+…+y(/n)(/-)1}で与えられる(台形公式)。最もよく使われるのはシンプソンの公式で,ほかにチェビシェフの公式,ガウスの公式がある。→数値計算法/数値制御工作機械/数値予報
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