python計算牛頓迭代多項式的方法

 　　這篇文章主要介紹了python計算牛頓迭代多項式的方法,涉及Python數學運算的相關技巧,需要的朋友可以參考下

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 ''' p = evalPoly(a,xData,x). Evaluates Newton's polynomial p at x. The coefficient vector 'a' can be computed by the function 'coeffts'. a = coeffts(xData,yData). Computes the coefficients of Newton's polynomial. ''' def evalPoly(a,xData,x): n = len(xData) - 1 # Degree of polynomial p = a[n] for k in range(1,n+1): p = a[n-k] + (x -xData[n-k])*p return p def coeffts(xData,yData): m = len(xData) # Number of data points a = yData.copy() for k in range(1,m): a[k:m] = (a[k:m] - a[k-1])/(xData[k:m] - xData[k-1]) return a

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