R语言如何从数据框中提取列作为矢量

在这篇文章中，我们将在R编程语言中把数据框架的列转换成一个矢量。

步驟 –

创建向量
通过传递这些向量创建一个数据框架
使用” [ [] ]” 操作符（索引）转换数据框架列。[[]]是用来访问数据框架列的。它是用来为数据框架做索引的。

语法。

dataframe_name[[‘column_name’]]

显示向量

例1 :

# creating a vector for names
names=c('siva nagulu','bhavanarayana','sireesha',
        'priyank chowdary','sridevi','ravi kumar')
  
# creating a vector for ages
ages=c(40,49,38,42,36,39)
  
#create a dataframe using these vectors
dataframe=data.frame(names,ages)
print(dataframe)
  
# converting ages dataframe column into vector
# by passing as index
my_data = dataframe[['names']]
print("--------convert into vector of names column-------")
print(my_data)
  
my_data = dataframe[['ages']]
print("--------convert into vector of ages column-------")
print(my_data)

输出。

如何在R语言中从数据框中提取列作为矢量？

例2 :

# creating a vector for city
city=c('kakumanu','hyd','noida')
  
# create a dataframe using this vector
dataframe=data.frame(city)
print(dataframe)
  
# converting city dataframe column into vector
# by passing as index
my_data = dataframe[['city']]
print("--------convert into vector of city column-------")
print(my_data)