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