用一个值减去一整列

Question

I am new to R and need a little help. I have a data set with 13 columns. One column has height measurements and is appropriately titled "Height". I want to subtract 2 from each value in that column. What function would I use to do so?

Answer 1

As in the comments,

yourdata$Height <- yourdata$Height - 2

will work to subtract two from the dataset "yourdata" and the column "Height", and then it replaces "<-" that column "yourdata$Height".

If you want to keep the original column as is, and add a new column, then you need to change the name of your new 'object'. Such as:

yourdata$HeightMinus2 <- yourdata$Height - 2

Answer 2

In addition to comments which work, a "tidy" way to do this is:

library(dplyr)
new_df <- initial_df %>% mutate(Height = Height - 2)