首先,R虽然作为一门编程语言,但它是一种解释性语言而非编译语言,即输入的命令能够直接被执行。 R对对象的名字是区分大小写的,所以x与X是可以代表两个完全不同的变量。 安装第三方包: >install.packages("packages") 如果要使用R当中的某一个包,需要加载: >library(packages) 一个对象的产生需要进行赋值,在R...
1. 使用SQL语句操作数据集 # Perform SQL Selects on R Data Frames > library('sqldf') > newdf <- sqldf("select * from mtcars where am=0") 2. 多表整合与重塑 # Flexibly reshape data > library('reshape') > newdata <- melt(mydata,id=(c("ID")) > adddata <- cast(newdata,formula...
R包下载设置镜像 代码语言:txt 复制 >options("repos"=c(CRAN="http://mirrors.tuna.tsinghua.edu.cn/CRAN/")) #安装R包 >if(!require(ggplot2))install.packages('ggplot2',update = F,ask = F) >if(!require(ggpubr))install.packages('ggpubr',update = F,ask = F) >if(!require(eoffice))...
learnr Thelearnrpackage makes it easy to turn anyR Markdowndocument into an interactive tutorial. Tutorials consist of content along with interactive components for checking and reinforcing understanding. Tutorials can include any or all of the following: ...
Dodaj u plan Deli putem Facebookx.comLinkedInE-pošta Odštampaj R Članak 31.05.2018. referral Returned to anLDAPclient by adirectory system agentwhen the query presented by the client cannot be serviced locally and the directory system agent has "knowledge information" about other director...
## Submit ```{r context="server"} learnrhash::encoder_logic() ``` ```{r encode, echo=FALSE} learnrhash::encoder_ui() ``` which results in the Submit topic appearing in the tutorial with all of the necessary shiny logic and ui inserted, as shown below. In the example above a...
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Learn R 专题1-3 画图思维 专题1 玩转字符串 玩转字符串 检测字符串长度 代码1 str_length(x) 代码语言:txt 复制 if(!require(stringr))install.packages('stringr') library(stringr) x <- "The birch canoe slid on the smooth planks." x
Improve your GPA with strategic online learning. Learn how to choose and use online courses to complement your... More fromThe Course Notes Our mission OpenCourser helps millions of learners each year. People visit us to learn workspace skills, ace their exams, and nurture their curiosity. ...