How to Compute the Sum of Data Frame Variables in R (2 Examples)

This article shows how to calculate sums of variables in R.

Creation of Example Data

data(iris)                    # Loading iris data frame
head(iris)
#   Sepal.Length Sepal.Width Petal.Length Petal.Width Species
# 1          5.1         3.5          1.4         0.2  setosa
# 2          4.9         3.0          1.4         0.2  setosa
# 3          4.7         3.2          1.3         0.2  setosa
# 4          4.6         3.1          1.5         0.2  setosa
# 5          5.0         3.6          1.4         0.2  setosa
# 6          5.4         3.9          1.7         0.4  setosa

Example 1: Get Sum of Only One Variable

sum(iris$Sepal.Length)        # Using sum function
# [1] 876.5

Example 2: Get Sum of All Numeric Variables in Data Frame

colSums(iris[ , 1:4])         # Using colSums function
# Sepal.Length  Sepal.Width Petal.Length  Petal.Width 
#        876.5        458.6        563.7        179.9

Leave a Reply

Your email address will not be published.

Fill out this field
Fill out this field
Please enter a valid email address.
You need to agree with the terms to proceed

Menu
Top