Calculate Sum of Two Data Frame Variables in R (2 Examples)
This tutorial shows how to compute the sum across two or more columns of a data frame in the R programming language.
Creation of Example Data
my_df <- data.frame(col1 = 1:5, # Construct data frame col2 = 2) my_df # Show data frame in RStudio console # col1 col2 # 1 1 2 # 2 2 2 # 3 3 2 # 4 4 2 # 5 5 2 |
my_df <- data.frame(col1 = 1:5, # Construct data frame col2 = 2) my_df # Show data frame in RStudio console # col1 col2 # 1 1 2 # 2 2 2 # 3 3 2 # 4 4 2 # 5 5 2
Example 1: Computing Sum of 2 Columns
my_df$col1 + my_df$col2 # Compute sum of 2 columns # [1] 3 4 5 6 7 |
my_df$col1 + my_df$col2 # Compute sum of 2 columns # [1] 3 4 5 6 7
Example 2: Adding Sum of 2 Columns as New Variable to Data Frame
my_df$col_sum <- my_df$col1 + my_df$col2 # Add sum as variable to data my_df # Print updated data frame # col1 col2 col_sum # 1 1 2 3 # 2 2 2 4 # 3 3 2 5 # 4 4 2 6 # 5 5 2 7 |
my_df$col_sum <- my_df$col1 + my_df$col2 # Add sum as variable to data my_df # Print updated data frame # col1 col2 col_sum # 1 1 2 3 # 2 2 2 4 # 3 3 2 5 # 4 4 2 6 # 5 5 2 7