What is a detach function in R
This recipe explains what is a detach function in R
Recipe Objective
If we want to unload or detach a package from the Rsearch path, we use detach function in R. It is an in-built function in R which also removes the R-objects (such as data.frame) available in the search path after using the attach function.
This recipe demonstartes how to use detach function
Step 1: loading required library and a dataset
# Data manipulation package
library(tidyverse)
# reading a dataset
customer_seg = read.csv('R_198_Mall_Customers.csv')
#summary of the dataset
glimpse(customer_seg)
Observations: 200 Variables: 5 $ CustomerID1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 1... $ Gender Male, Male, Female, Female, Female, Female, ... $ Age 19, 21, 20, 23, 31, 22, 35, 23, 64, 30, 67, ... $ Annual.Income..k.. 15, 15, 16, 16, 17, 17, 18, 18, 19, 19, 19, ... $ Spending.Score..1.100. 39, 81, 6, 77, 40, 76, 6, 94, 3, 72, 14, 99,...
Step 2: Detaching a dataframe
We first attach a dataframe and then use detach function to show it's application
Syntax: detach(x)
where: x = Dataframe or matrix
# we first use attach function to bring the dataframe in search Path
attach(customer_seg)
# Now accessing the variable by its name (Gender)
Gender
Male Male Female Female Female Female Female Female Male Female Male Female Female Female Male Male Female Male Male Female Male Male Female Male Female Male Female Male Female Female Male Female Male Male Female Female Female Female Female Female Female Male Male Female Female Female Female Female Female Female Female Male Female Male Female Male Female Male Female Male Male Male Female Female Male Male Female Female Male Female Male Female Female Female Male Male Female Male Female Female Male Male Male Female Female Male Female Female Female Female Female Male Male Female Female Male Female Female Male Male Female Female Male Male Male Female Female Male Male Male Male Female Female Male Female Female Female Female Female Female Male Female Female Male Female Female Male Male Male Male Male Male Female Female Male Female Female Male Male Female Female Male Female Female Male Male Male Female Female Male Male Male Female Female Female Female Male Female Male Female Female Female Male Female Male Female Male Female Female Male Male Male Male Male Female Female Male Male Male Male Female Female Male Female Female Male Female Male Female Female Female Female Male Female Female Female Female Male Male Male Levels: 'Female' 'Male'
# detaching a dataframe which was initially attached
detach(customer_seg)
# Now accessing the variable by its name
Gender
Error in eval(expr, envir, enclos): object 'Gender' not found Traceback:
Note: we cannot work with the variable name as before after using detach function
Step 3: Unloading a Package
# we unload the package using the same detach function
detach("package:tidyverse")
tidyverse::glimpse(customer_seg)
Error: 'glimpse' is not an exported object from 'namespace:tidyverse'
Traceback:
1. tidyverse::glimpse
2. getExportedValue(pkg, name)
3. stop(gettextf("'%s' is not an exported object from 'namespace:%s'",
. name, getNamespaceName(ns)), call. = FALSE, domain = NA)
Note: we cannot access any functions from the tidyverse package after detaching it
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