When assignment operator “<-“, “->” is used, R will store the result and not print it unless you type the variable name or call print() function. Comment sign: “#” >x<-5>x## Or print(x)[1]5 1.1.2 Working Directory and Files A bit similar to terminal command line tools....
3. 1:n 叫做The sequence operator,表达了从1到n的递增的一段数值向量。 4. Numeric Vector之间是可以进行数学计算的。当两个长度不相等的Numeric Vector之间进行计算时,长的那个vector决定最终结果的长度,短的vector会根据最终结果的长度被重复使用n次,我们把这个叫做The Recycling Rule。在下面这个例子里,x + y...
Whether or not an entry in the matrix is 0 or 1, is determined by drawing numbers from the binomial distribution. This distribution will yield a 1 with probability p and a o with probability (1-p). In R it will work like this, in the ith column (vertex i) , we require A[i,i]...
终于做完这周R Programming的作业了! 之前一直有报coursera的课程,但是总是没有坚持下去,这次收到他们的邮件推广,说data science系列课程开通了R语言的中文课程,有中文版论坛,有中文字幕,如此诚意满满,再不报名,就实在太落伍了。 为了让自己坚持,还花钱买了signature track,所以当这周五收到助教通知说,第一个编程作...
C Programming Notes for Data File Lab Your downloaded stage1.tar file contains the following files: filestruct-description.txt: A simple description of the fields that are in your struct – their names and type description. initialisation-specification.txt: Specifies the initial valu...
This course is part of several tracks, including Data Analyst with R, Data Scientist with R, and R Programming, all of which can help you develop your knowledge. Prerequisites There are no prerequisites for this course 1 Intro to basicsStart Chapter Take your first steps with R. In this ...
To gain an understanding of the similarities and differences between R language analyses and C# language programming, it’s useful to examine a C# implementation of a chi-square test. In addition, the C# code can make a nice addition to your personal code library. Take ...
1: R Programming 2: Take me to the swirl course repository! Selection: 1 | Please choose a lesson, or type 0 to return to course menu. 1: Basic Building Blocks 2: Workspace and Files 3: Sequences of Numbers 4: Vectors 5: Missing Values 6: Subsetting Vectors 7: Matrices and Data ...
指派问题(assignment problem) 属于0 - 1 整数规划,是一种特殊的整数规划问题。指派问题的标准形式(以人和事为例) 是:有n 个人和n 个事,已知第i 个人做第j 件事的费用为Cij (i; j = 1, 2,…n),要求确定人和事之间的一一对应的指派方案,使完成n件事的总费用最少。
ProgrammingAssignment2:Coursera 上 R 编程的编程作业 2 存储库 开发技术 - 其它Ce**囚碟 上传3KB 文件格式 zip 介绍 第二个编程任务将要求您编写一个能够缓存潜在耗时计算的 R 函数。 例如,取数字向量的平均值通常是一种快速操作。 然而,对于一个很长的向量,计算均值可能需要很长时间,特别是如果它必须重复...