R是一种用于统计计算和图形的编程语言，由R核心团队和R统计计算基金会支持。R由统计学家Ross Ihaka和Robert Gentleman创建，在数据挖掘者和统计学家中被用于数据分析和开发统计软件。用户已经创建了软件包来增强R语言的功能。

assignmentutor-lab™ 为您的留学生涯保驾护航 在代写R语言方面已经树立了自己的口碑, 保证靠谱, 高质且原创的统计Statistics代写服务。我们的专家在代写R语言代写方面经验极为丰富，各种代写R语言相关的作业也就用不着说。

• 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|R语言代写R language代考|The need to be understandable to people

When you write a script, it is either because you want to document what you have done or you want re-use the script at a later time. In either case, the script itself although still meaningful for the computer, could become very obscure to you, and even more to someone seeing it for the first time. This must be avoided by spending time and effort on the writing style.
How does one achieve an understandable script or program?

• Avoid the unusual. People using a certain programming language tend to use some implicit or explicit rules of style-style includes indentation of statements, capitalization of variable and function names. As a minimum try to be consistent with yourself.
• Use meaningful names for variables, and any other object. What is meaningful depends on the context. Depending on common use, a single letter may be more meaningful than a long word. However self-explanatory names are usually better: e.g., using $\mathrm{n}$. rows and $\mathrm{n}$. cols is much clearer than using $\mathrm{n} 1$ and $\mathrm{n} 2$ when dealing with a matrix of data. Probably number. of. rows and number. of. columns would make the script verbose, and take longer to type without gaining anything in return.
• How to make the words visible in names: traditionally in $\mathrm{R}$ one would use dots to separate the words and use only lower case. Some years ago, it became possible to use underscores. The use of underscores is quite common nowadays because in some contexts it is “safer”, as in some situations a dot may have a special meaning. What we call “camel case” is only infrequently used in R programming but is common in other languages like Pascal. An example of camel case is NumCols.

## 统计代写|R语言代写R language代考|Debugging scripts

The use of the word bug to describe a problem in computer hardware and software started in 1946 when a real bug, more precisely a moth, got between the contacts of a relay in an electromechanical computer causing it to malfunction and Grace Hooper described the first computer bug. The use of the term bug in engineering predates the use in computer science, and consequently, the first use of bug in computing caught on easily because it represented an earlier-used metaphor becoming real.

A suitable quotation from a letter written by Thomas Alva Edison 1878 (as given by Hughes 2004):

It has been just so in all of my inventions. The first step is an intuition, and comes with a burst, then difficulties arise-this thing gives out and [it is] then that “Bugs”-as such little faults and difficulties are called-show themselves and months of intense watching, study and labor are requisite before commercial success or failure is certainly reached.

The quoted paragraph above makes clear that only very exceptionally does any new design fully succeed. The same applies to R scripts as well as any other nontrivial piece of computer code. From this it logically follows that testing and debugging are fundamental steps in the development of R scripts and packages. Debugging, as an activity, is outside the scope of this book. However, clear programming style and good documentation are indispensable for efficient testing and reuse.

# R语言代写

## 统计代写|R语言代写R language代考|The need to be understandable to people

• 避免异常。使用某种编程语言的人倾向于使用一些隐式或显式的风格风格规则，包括语句的缩进、变量和函数名的大写。作为最低限度，尽量与自己保持一致。
• 对变量和任何其他对象使用有意义的名称。什么是有意义的取决于上下文。根据常用用途，单个字母可能比长词更有意义。然而，不言自明的名称通常更好：例如，使用n. 行和n. cols 比使用更清晰n1和n2在处理数据矩阵时。应该是数。的。行数和数。的。列会使脚本变得冗长，并且需要更长的时间来键入而不会获得任何回报。
• 如何使单词在名称中可见：传统上在R一个人会使用点来分隔单词并且只使用小写。几年前，使用下划线成为可能。如今，下划线的使用非常普遍，因为在某些情况下它“更安全”，因为在某些情况下，点可能具有特殊含义。我们所说的“驼峰式”只是在 R 编程中很少使用，但在其他语言（如 Pascal）中很常见。骆驼案例的一个例子是 NumCols。

## 有限元方法代写

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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。

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