Get the Sum of Each Column in R

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DataDaft

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Published on July 1, 2019 4:33:08 PM ● Video Link: https://www.youtube.com/watch?v=3ZraCIdanf4

Duration: 1:19

7,486 views

38

Aggregating each column with a column sum or total is a common operation that can be achieved using the built in R function colSums()

Code used in this clip:

data = mtcars
head(data)

colSums(data)

# Column sums with apply
apply(data,
FUN = sum,
MARGIN = 2)


Code Clips are basic code explanations in 2 minutes or less. They are intended to be short reference guides that provide quick breakdowns and copy/paste access to code needed to accomplish common data science tasks. Think Stack Overflow with a video explanation.


* Note: YouTube does not allow greater than or less than symbols in the text description, so the code above will not be exactly the same as the code shown in the video! For R that means I may use = for assignment and the special Unicode large ＜ and ＞ symbols in place of the standard sized ones for dplyr pipes and comparisons. These special symbols should work as expected for R code on Windows, but may need to be replaced with standard greater than and less than symbols for other operating systems.