In this article, we will see how to get the structure of a DataFrame in R programming.
Structure of a dataframe generally means the inner details about the dataframe.
Steps for Getting Structure of DataFrame:
- Create dataframe.
- The size of each vector should be the same.
- Follow the syntax while creating data frames.
Function Used:
To get the structure of a data frame we use a built-in function called str().
Syntax: str( Dataframe_name )
We have to pass the data frame which is already created.
If we don’t pass an already created data frame we won’t get an output.
Now, let’s see through the examples of how to create a dataframe of different column sizes in R. The examples demonstrated here are performed in R studio which is the most used IDE for R programming.
Example 1: Creating a data frame with 2 columns
df1 = data.frame(id = c(1 ,2 , 3), name = c("karthik" , "nikhil" ,"sravan"))
print(df1)
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Output:
Example 2: Creating dataframe with 3 columns
Note: Here the command “df2” and “print(df2)” have the same result, hence “df2” is used because it’s simpler than the other.
df2 = data.frame(sid = c(1, 2, 3),
sname = c("karthik" , "nikhil" , "sravan"),
Branch = c("IT" , "CSE" , "IT"))
df2 |
Output:
Example 3: Creating dataframe with 4 columns
df3 = data.frame(eid = c(1, 2, 3) ,
ename = c("krishna" , "nikhil" , "manoj"),
salary = c(50,000 , 60,000 , 70,000),
Designation = c("senior manager" , "HR" , "Manager"))
df3 |
Output:
Getting the structure of a given data frame
Example 1: Structure of df1
df1 = data.frame(id = c(1 , 2, 3),
name = c("karthik" , "nikhil" , "sravan"))
str(df1)
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Output:
Example 2: Structure of df2
df2 = data.frame(sid = c(1, 2, 3),
sname = c("karthik" , "nikhil" , "sravan"),
Branch = c("IT" , "CSE" , "IT"))
str(df2)
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Output:
Example 3: Structure of df3
df3 = data.frame(eid = c(1, 2, 3) ,
ename = c("krishna" , "nikhil" , "manoj"),
salary = c(50000 , 60000 , 70000),
Designation = c("senior manager" , "HR" , "Manager"))
str(df3)
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Output: