中文说明：这个简短的代码是非常适用于为学生和科学家的常规应用。此代码的输入是一个向量和输出是一个标量值。可以对输入的大小会发生变化。
English Description：
This Short code is very applicable in routine application for students and scientists . The input of this code is a vector and that output is a scalar value. The size of input can be vary.