[R language] [1] beginners learn the grammar of R language and edit it with rstudio

Preface

I think R Ranking so high , mapping It's very nice , I'm going to learn , In the future, I will use this thing to process data and draw graphs

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Knock anything

Type a few lines of code first , Whatever it means

a=rnorm(100)
plot(a)
print(' I'm Yi Shijun ')


h <- c(1,2,3,4,5,6)
M <- c("A","B","C","D","E","F")
barplot(
    h,
    names.arg=M,
    xlab="X",
    ylab="Y",
    col="#00c0c9",
    main="Chart",
    border="#fdcb6e"
)


C1 <- c(1,2,3,4)
C2 <- c(1,2,3,4)
C3 <- c(1,2,3,4)
C4 <- c(1,2,3,4)
C5 <- c(1,2,3,4)
mydata_frame <- data.frame(C1,C2,C3,C4,C5)
View(mydata_frame)

I still don't know how to configure launch.json, Or not vscode 了 . Use Rstudio To write R The language code

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Basic grammar and operation

= Left assignment
<- Left assignment （ $Alt-$ ）
<<- Left assignment

-> Right assignment
->> Right assignment

Operation point Source（$CtrlAltR$）

Multiline comment $CtrlShiftC$

Copy and paste a line （$CtrlShiftD$）

c() Is to turn several values into a list

restart R（$CtrlShiftF10$）

String concatenation ：s=cat(1,"cat",'dog',2)

Wrap a piece of code into a function ：$CtrlAltX$

try <- function() {
    
  s=cat(1,"cat",'dog',2)
}

Clear the console ：$CtrlL$

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Data and Value window

nums <- rnorm(100) #100 A random number 

mat <- matrix(nums,ncol=2) # Split into two columns 

means <- Matrix::colMeans(mat) # averaging 

data and value Is the difference between the vector Format variables are placed in values below , Other things like matrix、dataframe、factor、list、arrary Format variables are placed in data

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Pipeline functions

%>%
（$CtrlShiftM$ , Also turn off the shortcut key of the input method ）

rnorm(100) %>% matrix(ncol=2) %>% Matrix::colMeans()

The result of the previous function is the first parameter of the next function

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