我想使用拉格朗日插值法来插值一个多项式,但是这段代码无法正常工作:
def interpolate(x_values, y_values):
def _basis(j):
p = [(x - x_values[m])/(x_values[j] - x_values[m]) for m in xrange(k + 1) if m != j]
return reduce(operator.mul, p)
assert len(x_values) != 0 and (len(x_values) == len(y_values)), 'x and y cannot be empty and must have the same length'
k = len(x_values)
return sum(_basis(j) for j in xrange(k))
我跟随维基百科的方法,但当我运行它时,在第三行收到了一个IndexError错误!
谢谢