How to Sum Specific Columns in R

To calculate sum of specific column of dataframe you can use rowSums() function in R.

The following method shows how you can do it with syntax.

Method 1: Use rowSums() Function

rowSums(df[ , c(columns to sum)])

The following example shows how to use rowSums() function in R.

Use rowSums() to Calculate Sum of Specific Columns

Let’s see how we can calculate sum of specific column of data frame:

# Create data frame
df <- data.frame(Machine_name=c("A","B","C","D","E","F"),
                 Pressure=c(78.2, 71.7, 80.21, 83.12, 82.56, 79.50),
                 Temperature=c(31, 35, 36, 36, 38, 32),
                 Status=c(TRUE,TRUE,FALSE,FALSE,FALSE,TRUE))

# Calculate sum of specific columns                 
sum<-rowSums(df[ , c("Pressure","Temperature")])

# Print sum
print(sum)

Output:

[1] 109.20 106.70 116.21 119.12 120.56 111.50

As the output shows sum of “Pressure” and “Temperature” column of dataframe.