How to create a function and add results as a column?

Question

If I have a dataframe:

and I want to add a column D that is the sum of columns A,B,C how do I write a function that will do that and add the result as column D to the data frame?

Does this answer your question? Add column sum to table

Sam Firke
– Sam Firke

2020-08-27 15:51:48 +00:00
Commented Aug 27, 2020 at 15:51 — Sam Firke
– Sam Firke, Commented Aug 27, 2020 at 15:51

symbolrush · Accepted Answer · 2020-08-27 13:42:34Z

2

One way is with rowSums:

df <- data.frame(a = 1:3, b = 2:4, c = 3:5)
df$d <- rowSums(df)

answered Aug 27, 2020 at 13:42

symbolrush

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Comments

Claudio Paladini · Accepted Answer · 2020-08-27 15:57:43Z

1

One way is with mutate from the library dplyr:

library(dplyr)
df <- data.frame(a = 1:3, b = 2:4, c = 3:5)

df = df %>%
       mutate(d = a + b + c)

answered Aug 27, 2020 at 15:57

Claudio Paladini

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1 Comment

yaynikkiprograms Over a year ago

Thank you! I Think the mutate function is what I need.

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