# How to find the sum of column values of an R dataframe?

• Last Updated : 30 May, 2021

In this article, we are going to find the sum of the column values of a dataframe in R with the use of sum() function.

Syntax:

sum(dataframe\$column_name)

### Creating a Dataframe

A dataframe can be created with the use of data.frame() function that is pre-defined in the R library. This function accepts the elements and the number of rows and columns that are required for the dataframe to be created.

Following is an R Program for the creation of dataframe:

## R

 `# R Program to create a dataframe`` ` `# Creating a Data Frame``df<-``data.frame``(row1 = 0:2, row2 = 3:5, row3 = 6:8)``print``(df)`

Output:

```  row1 row2 row3
1    0    3    6
2    1    4    7
3    2    5    8```

### Computing Sum of Column Values

R language provides an in-built function sum() to compute the mean of a dataframe. Following is an R program for the implementation of sum().

## R

 `# Computing sum of column values`` ` `# Using sum() function``sum``(df\$row1)``sum``(df\$row2)`

Output:

```3
12```

Example 2:

## R

 `# R program to illustrate dataframe ``Roll_num = ``c``(01, 02, 03)``Age = ``c``(22, 25, 45)``Marks = ``c``(70, 80, 90)``   ` `# To create dataframe use data.frame command and ``# then pass each of the vectors  ``# we have created as arguments ``# to the function data.frame() ``df = ``data.frame``(Roll_num, Age, Marks) ``print``(df)`` ` `# Computing Sum using sum() function``sum``(df\$Roll_num)``sum``(df\$Age)``sum``(df\$Marks)`

Output:

```6
92
240```

Example 3:

## R

 `# R program to illustrate dataframe ``ID = ``c``(01, 02, 03)``Age = ``c``(25, 30, 70)``Salary = ``c``(70000, 85000, 40000)``   ` `# To create dataframe use data.frame command and ``# then pass each of the vectors  ``# we have created as arguments ``# to the function data.frame() ``df = ``data.frame``(ID, Age, Salary) `` ` `# Computing total salary``cat``(``"Total Salary ="``, ``sum``(df\$Salary))`

Output:

`195000`

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