R language Note Attach (), detach (), and with ()

function attach () to add a data frame to the search path of R. R after encountering a variable name, the search path will be checked
The data frame in the path to navigate to this variable

Summary (Mtcars)

> Plot (mtcars$mpg)
> Plot (MTCARS$HP)

The fields in the Mtcars are as far as possible in the variables.

> Attach (Mtcars)
> Plot (MPG)
> Plot (HP)
> Detach (Mtcars)

The function detach () removes the data frame from the search path. It is important to note that detach () does not make the data frame itself
Do any processing

In addition, the other way is to use the function with (). You can rewrite the previous example like this:

> With (mtcars,{

+ Summary (MPG,HP)

+ Plot (MPG,HP)
+ Plot (MPG,WT)
+ })

R language Note Attach (), detach (), and with ()