R1基础

title: "note1"

output: html_document

date: "2023-05-09"

knitr::opts_chunk$set(echo = TRUE,message = F,warning = F)

R Markdown

#后面是注释，不会运行,路径补充
# 文件在桌面上，不在工作目录下，怎样读取
# 绝对路径，换了电脑就读不成功
x1 = read.csv("C:/Users/win10/Desktop/x.csv")
# 相对路径，文件的相对位置正确，则可以读成功
x1 = read.csv("../x.csv")
# 把x.csv放进了工作目录下的test文件夹里
x1 = read.csv("test/x.csv")
# 把整个biotrainee换个位置或者发给别人，仍然可以读取成功
# >是R语言的命令提示符
# ()前面的单词是函数,【】前面是向量，因为是向量取子集专属符号
# 文件都在工作目录下面，getwd()查看工作目录放在哪里
# +表示命令不完整；补全或按ESC退出
# R Mrakdown：CTAL+ALT+i即可插入3个反引号（tab键上面的波浪号）
# 数据类型class（）,numeric数据型,character字符型,logical逻辑型

引用生信技能树

This is an R Markdown document. Markdown is a simple formatting syntax for authoring HTML, PDF, and MS Word documents. For more details on using R Markdown see http://rmarkdown.rstudio.com.

When you click the Knit button a document will be generated that includes both content as well as the output of any embedded R code chunks within the document. You can embed an R code chunk like this:

summary(cars)

Including Plots

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plot(pressure)

Note that the echo = FALSE parameter was added to the code chunk to prevent printing of the R code that generated the plot.