Submitted by : Rahul Swami
Programming language: R
Posted on : 09-06-2019 06:59:34p

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A data frame is a collection of variables which share many of the properties of matrices and lists. More precisely, a data frame is a list of variables of the same length with unique row names. It is given class name ”data.frame”.

 

Create Data Frame

 

id=c(1:10)
name=c("emma","well","rich","rahul","sam","shiv","raj","mayur","sush","rock")
salary=c(122,251,824,454,556,767,876,596,395,345)
emp=data.frame(id,name,salary)
print(emp)

 

When you execute the above code, it produces the following output :

 

 

emp$id - is one way to access a variable inside the data frame.

emp$id[1] - access first element of the vector.

emp$id[2:3] - access a subset of elements.

emp$name[c(5,7)] - access elements 5 and 7.

 

emp$id
emp$id[1]
emp$id[2:5]
emp$name[c(5,7)]

 

output -

 

Summary of Data

 

The statistical summary of the data can retrived by using summary() function.

id=c(1:10)
name=c("emma","well","rich","rahul","sam","shiv","raj","mayur","sush","rock")
salary=c(122,251,824,454,556,767,876,596,395,345)
emp=data.frame(id,name,salary)
summary(emp)

 

When you execute the above code, it produces the following output :