### 统计代写|数据结构作业代写data structure代考|What is a Linked List

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• Statistical Inference 统计推断
• Statistical Computing 统计计算
• (Generalized) Linear Models 广义线性模型
• Statistical Machine Learning 统计机器学习
• Longitudinal Data Analysis 纵向数据分析
• Foundations of Data Science 数据科学基础

## 统计代写|数据结构作业代写data structure代考|Issues with Linked Lists

There are a number of issues wàth linked lists. The main disadvautage of lanked lists is access time to individual elements. Array is randonaccess, which means it takes $\mathrm{O}(1)$ to access any clement in the array. I inked lists ake $O(n)$ for access to an element an the list in the worst case. Another advantage of arrays in access tine is spacial locality in menory. Arays are defined as contiguous blocks of nuenory, and so any array element will be physically near its neighbors. This greatly benefits from modern CTI caching methods.

Although the dynamic allocation of storage is a great advantage, the overhead with storing and retricving data can nake a big differeace. Sometimes limked lists are hard to manipulate. If the last item is deleted, the last but one must then have its pointer changed to hold a None reference. This requires that the list is traversed to find the last but one link, and its poanter set to a None relerence. Finally, linked lists waste menory in terms of extra reference points.

The advantage of a doubly linked list (also called two – way linked list) is that given a node in the list, we can navigate in both directions. A mode in a singly linked list cuamot be renoysd uakss we have the poiater to its predecessor. But in a doubly linked list, we can delete a mode even if we dou’t have the previous mode’s address (since each node has a left pointer pointiag to the previous node and can move backward).

• Each node requires an extra pointer, requiring more space.
• The insertion or deletion of a node takes a bit longer (more pointer operations).
Similar to a singly linked list, let us implement the operations of a doubly linked list. If you understand the singly linked list operations, then doubly linked list operations are obwious. Following is a type declaration for a doubly linked list of integers:

## 统计代写|数据结构作业代写data structure代考|Skip Lists

Binary trees can be used for represcuting abstract data types such as dictionaries and ordered lists. They work well when the elenucnts are inserted in a randon order. Sonve sequences of operations, such as inserting the elensents in order, produce degcnerate data stroctures that give very poor performance. If it were possable to randomaly permute the list of itens to be inserted, trees would work well waith high probability for any iaput sequence. In most cases queries must be answered oas-line, so randomly permutimg the anput is impractical. Balanced tree algorithas re-arrange the tree as operations are performed to maintain certain balance couditions and assure good performance.

Skip list is a data structure that can be used as an altemative to balanced biaary trees (refer to Trees chapter). As compared to a binary trec, skip lists allow quick search, insertion aad deletion of elements. This is achicved by using probabilistic balaucing rather than strictly enforce balancing. It is basically a linked list with additional poanters such that internediate modes can be skipped. It uses a randon mumber generator to maike some decisions.In an ordinary sorted linked list, search, insert, ausd delete are in $\mathrm{O}(\mathrm{n})$ because the list must be scanned node-by-node from the head to find the relevant node. If somehow, we could scan down the list in bagher steps (skip down, as it were), we would reduce the cost of scauniag. This is the fuadanacntal xlea behind Skip I.sts.

## 统计代写|数据结构作业代写data structure代考|Issues with Linked Lists

• 每个节点都需要一个额外的指针，需要更多空间。
• 节点的插入或删除需要更长的时间（更多的指针操作）。
类似于单链表，让我们实现双链表的操作。如果您了解单链表操作，那么双链表操作是显而易见的。以下是整数双向链表的类型声明：

## 广义线性模型代考

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## MATLAB代写

MATLAB 是一种用于技术计算的高性能语言。它将计算、可视化和编程集成在一个易于使用的环境中，其中问题和解决方案以熟悉的数学符号表示。典型用途包括：数学和计算算法开发建模、仿真和原型制作数据分析、探索和可视化科学和工程图形应用程序开发，包括图形用户界面构建MATLAB 是一个交互式系统，其基本数据元素是一个不需要维度的数组。这使您可以解决许多技术计算问题，尤其是那些具有矩阵和向量公式的问题，而只需用 C 或 Fortran 等标量非交互式语言编写程序所需的时间的一小部分。MATLAB 名称代表矩阵实验室。MATLAB 最初的编写目的是提供对由 LINPACK 和 EISPACK 项目开发的矩阵软件的轻松访问，这两个项目共同代表了矩阵计算软件的最新技术。MATLAB 经过多年的发展，得到了许多用户的投入。在大学环境中，它是数学、工程和科学入门和高级课程的标准教学工具。在工业领域，MATLAB 是高效研究、开发和分析的首选工具。MATLAB 具有一系列称为工具箱的特定于应用程序的解决方案。对于大多数 MATLAB 用户来说非常重要，工具箱允许您学习应用专业技术。工具箱是 MATLAB 函数（M 文件）的综合集合，可扩展 MATLAB 环境以解决特定类别的问题。可用工具箱的领域包括信号处理、控制系统、神经网络、模糊逻辑、小波、仿真等。