<aside> 💡 SciPy provides algorithms for optimization, integration, interpolation, eigenvalue problems, algebraic equations, differential equations, statistics and many other classes of problems.

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• 寻找极值点

extrema_index_list 
	= scipy.signal.argrelextrema(np.array( S_list ) ,
															 np.less , 
						 									 order = 1 )[ 0 ]  # 取索引而非之后的布尔
fre_extrema_index = np.array(frequencies_list)[ extrema_index_list] 
	# 使用no.array()[]进行列表序列访问，而非将列表直接置于中括号操作符中。