普林斯顿大学Trevor Martin的R语言入门指南

R 语言
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"The Undergraduate Guide to R by Trevor Martin Princeton University" 是一本针对R编程语言初学者的指南，由普林斯顿大学的Trevor Martin撰写。本书采用创作共用版权，并提供了关于R语言的基本介绍，包括安装、基础概念、数据类型、数据输入输出、绘图、函数以及编写高效R代码的技巧。 书中详细介绍了以下知识点： 1. **欢迎章节**：这部分主要面向的读者群体，鼓励即使没有编程经验的学生也应尝试学习R语言，并提供了如何有效使用本书的指导。 2. **R语言是什么**：回顾了R语言的历史，解释了其当前在统计分析和数据科学中的重要地位，使读者了解R语言的基本背景。 3. **安装R**：详述了如何下载R软件，如何进行安装，以及配置R环境的步骤，确保读者能够顺利搭建R编程环境。 4. **基础知识**：涵盖了基本的代数运算，向量和矩阵的概念，以及数据操作和循环语句的使用，这些都是R语言的基础。 5. **数据类型**：讨论了R中的不同数据类型，如数值、字符、逻辑等，并解释了如何转换和利用这些类型。 6. **数据输入**：介绍了各种数据输入类型，以及如何将外部数据导入到R环境中，这对于数据分析至关重要。 7. **数据绘图**：教授了创建点图、直方图、箱线图等基本图表的方法，以及如何在图表上添加额外元素以增强可视化效果。 8. **数据导出**：讲解了不同类型的输出格式，以及如何将处理后的数据导出到文件，方便后续使用或共享。 9. **函数**：分为内置函数和自定义函数两部分，帮助读者理解和运用R中的函数，提升编程能力。 10. **编写良好R代码的技巧**：提供了编写高效、易读代码的一般原则，如矩阵乘法的优化，提前规划代码结构，调试技巧，寻求帮助的途径，以及利用R包扩展功能。 这本书是R语言初学者的理想入门资源，通过系统的学习，读者不仅可以掌握R语言的基础，还能获得在实际项目中应用R语言的实用技能。

The Princeton Companion to Mathematics

2016-08-23 上传
The Princeton Companion to Mathematics 作者: Gowers, Timothy (EDT)/ Barrow-Green, June (EDT)/ Leader, Imre (EDT) 出版社: Princeton University Press 出版日期: 2008-9-28 总页数: 1056 定价: USD 99.50 ...

The Sleeping Teaching Assistant A university computer science department has a teaching assistant (TA) who helps undergraduate students with their programming assignments during regular office hours. The TA’s office is rather small and has room for only one desk with a chair and computer. There are three chairs in the hallway outside the office where students can sit and wait if the TA is currently helping another student. When there are no students who need help during office hours, the TA sits at the desk and takes a nap. If a student arrives during office hours and finds the TA sleeping, the student must awaken the TA to ask for help. If a student arrives and finds the TA currently helping another student, the student sits on one of the chairs in the hallway and waits. If no chairs are available, the student will come back at a later time. Using POSIX threads, mutex locks, and/or semaphores, implement a solution that coordinates the activities of the TA and the students. Details for this assignment are provided below. Using Pthreads, begin by creating N students. Each will run as a separate thread. The TA will run as a separate thread as well. Student threads will alternate between programming for a period of time and seeking help from the TA. If the TA is available, they will obtain help. Otherwise, they will either sit in a chair in the hallway or, if no chairs are available, will resume programming and will seek help at a later time. If a student arrives and notices that the TA is sleeping, the student must notify the TA using a semaphore. When the TA finishes helping a student, the TA must check to see if there are students waiting for help in the hallway. If so, the TA must help each of these students in turn. If no students are present, the TA may return to napping. Perhaps the best option for simulating students programming—as well as the TA providing help to a student—is to have the appropriate threads sleep for a random period of time using the sleep() API:

2023-06-04 上传
This is a programming assignment that requires the use of POSIX threads, mutex locks, and/or semaphores to coordinate the activities of the TA and the students. Here is one possible solution: 1. ...

用Java设计一个学生信息读取器可以展示学生的学号和名字，采用面向抽象编程和面向接口的编程实现。其中：除了主类外，还有学生类Student和三类学生，即本科生（Undergraduate）、硕士生（Master Degree Candidate）和博士生（Doctoral Candidate），以及的学生信息读取器StuInfoReader和大学（University）。其中：大学负责学生相关信息的设定。

2023-05-24 上传
以下是Java代码实现： 首先是学生类Student，这是一个抽象类，其中定义了学号和名字两个属性及对应的getter和setter方法。... System.out.println(university.getStudentInfo(undergraduate)); } } ```

帮我写一封邮件，来应聘大学的食品专业老师岗位

2023-04-04 上传
I am writing to express my interest in the position of Food Science Professor at [University Name]. I believe my academic qualifications and teaching experience make me an excellent candidate for this...

用英语介绍桂林电子科技大学

2023-03-11 上传
The university offers undergraduate, graduate, and doctoral programs in various disciplines, including engineering, science, management, and humanities. It has a strong focus on research and ...

pp[j1] = malloc(sizeof(Undergraduate)); cin>>other; b = Undergraduate(Name,Age,other); Undergraduate *pb = (Undergraduate *)pp[j1]; *pb = b; ptypes[j1] = "Undergraduate"; 关于此代码片段，*pb = b处出错原因及修改方法

2023-06-03 上传
因此，正确的做法是在Undergraduate类中添加一个复制构造函数或者重载赋值运算符。 修改后的代码如下所示： ``` pp[j1] = malloc(sizeof(Undergraduate)); cin >> other; Undergraduate b(Name, Age, other); ...

补全以下代码private String cid;// Course id, e.g., CS110. private String name;// Course name, e.g., Introduce to Java Programming. private Integer credit;// Credit of this course private GradingSchema gradingSchema; //Grading schema of this course // enum GradingSchema{FIVE_LEVEL, PASS_FAIL} private Integer capacity;// Course capacity. private Integer leftCapacity;// Course capacity left. You should update the left capacity when enrolling students. private Set<Timeslot> timeslots;// One course may have one or more timeslots. e.g., a lecture in Monday's 10:20-12:10, and a lab in Tuesday's 14:00-15:50. public Course(String cid, String name, Integer credit, GradingSchema gradingSchema, Integer capacity) // constructor public void addTimeslot(Timeslot timeslot) //Record a timeslot for this course private Integer id;// A unique student id, should be an 8-digit integer: Undergraduates' ids should start with 1; Postgraduates' ids should start with 3. e.g., 12213199. private String name;// Student’s name private Map<Course, Grade> courses;// Enrolled courses, using Map structure to store course and its grade as a pair. Grade is an enum type enum Grade{PASS,FAIL,A,B,C,D,F}with an attribute: Double gradePoint protected Student(Integer id, String name) // constructor public abstract boolean canGraduate() // Checks if this student satisfies all the graduating conditions. Hint: you are allowed to change this abstract method into non-abstract to check if the student satisfies the common graduation conditions. public void enroll(Course course) // Tries to enroll the course, do some checks before enrolling. public void recordGrade(Course course, Grade grade)// Records the grade of a course that is current learning. public double getGpa() // Calculates the GPA for this student. public UndergraduateStudent(Integer id, String name)// constructor public boolean canGraduate() //Additional graduating conditions for undergraduate students public PostgraduateStudent(Integer id, String name)// constructor public boolean canGraduate() //Additional graduating conditions for postgraduate students

2023-06-02 上传
Hint: you are allowed to change this abstract method into non-abstract to check if the student satisfies the common graduation conditions. public void enroll(Course course) { if (course....

write a briefing on NUDT

2023-04-05 上传
The university offers undergraduate, graduate, and doctoral programs in a range of fields, including computer science, electrical engineering, and mathematics. It has a large student body, with over ...

Implicit instantiation of undefined template 'std::vector<Undergraduate>'

2023-06-11 上传
这个错误信息通常表示您在使用 `std::vector<Undergraduate>` 时，编译器无法找到 `Undergraduate` 类型的定义。可能有以下几个原因： 1. 您没有包含 `Undergraduate` 类型的头文件或声明。 2. `Undergraduate` ...

设计一个学生类student和它的一个子类undergraduate

2023-03-17 上传
undergraduate = Undergraduate("小明", "20221101", 20, "计算机科学") print(undergraduate.get_name()) # "小明" print(undergraduate.get_student_id()) # "20221101" print(undergraduate.get_age()) # 20 ...
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