数学是一门包含了很多知识的学科，研究数量、机构、变化、空间等，一直以来都是留学申请专业的热门，数学专业人才在目前的新兴领域与常青领域的需求持续走高，如人工智能产业、IT和金融等领域。数学专业作为一个研究性、学术性极强的专业，学习难度可以说是位于金字塔顶层级别里，当同学们遇到无法完成的作业或者考试时，请让Topmask 数学代考服务，为您排忧解难。
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Math代考常见问题解答
Q：数学代考的详细服务流程是怎么样的？
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下面是一个编程原理的数学考试高分案例，更多案例联系微信客服了解噢：
Question 1 Numerical derivative
The object of this exercise is to create functions which can compute their own numerical derivative. Given a real-valued function f of one real variable, and a small δ>0, the derivative of f at a point x can be approximated by the central difference approximation:
1. (a)
Create a package derivative containing a module derivative.py . Make the packages in this repository installable. You will aid your own completion of the exam by installing this package in editable mode.
1. (b)
(i)
Create a class derivative.derivative.Function whose constructor takes a function fn as an input and stores it. This is the function we will evaluate and whose derivative we will take.
(ii)
Implement the __call__ special method on Function to take a single argument (the value of x), evaluate fn on that input, returning the result.
1 (c)
(i)
Implement a subclass of Function called CentralDifferenceFunction . The constructor of this class should take fn and a scalar parameter delta . This constructor should call the superclass constructor to store fn , and it should store delta on the object instance.
(ii)
Implement a method CentralDifferenceFunction.derivative which takes two parameters, x and delta . The delta parameter should be made optional by giving it a default value of None . The derivative method should return the central difference approximation to the gradient of fn at x . If delta is passed to the method, then this value should be used in the calculation. If the argument is omitted then the value of delta passed in to the constructor should be used.
1 (d)
(i)
Implement a new subclass of Exception named ConvergenceError . The new exception does not need to have any new methods or attributes.
(ii)
Implement a subclass of CentralDifferenceFunction called AdaptiveCentralDifferenceFunction . The constructor of this class should have parameters fn , delta , eps , and max_its . The constructor should call the superclass constructor to store fn and delta , and should store eps and max_its directly on the object.
(iii)
Implement a method AdaptiveCentralDifferenceFunction.derivative which takes x as an argument. This function should call the superclass derivative method for a sequence of values of delta . The first value of delta should be the one passed to the class constructor. The next value of delta should be half the first value. This counts as the first iteration. The method should keep calculating more estimates of the derivative, each time with delta half that of the previous time. This sequence stops when the first of the following conditions is satisfied:
1. The absolute value of the difference between successive derivative approximations falls below eps . In this case the iteration has succeeded and the last calculated approximation should be returned.
2. The number of iterations exceeds max_its . In this case, the iteration has failed and the method should raise ConvergenceError with the message “Failed to converge within the allowed number of iterations.”
