R important things

R has no block comment, but you can still do the following things:

• In RStudio: Ctrl+Shift+C
• if(false){xxx} block

python to R

df.tail() -> tail(df)

dropna(df) ->na.omit(df) / df[complete.cases(df),]

df.describe() -> summary(df), library(psych): describe(df)

df.shape -> dim(df)