How to Add Columns to a Data Frame in R

DataDaft
DataDaft
34.5 هزار بار بازدید - 5 سال پیش - Adding columns to a data
Adding columns to a data frame is a common part of the feature exploration and engineering process.

Code used in this clip:

Load some data
df = mtcars[,c(1,2,4,6)]
head(df)

Add a column with a given name
df["hp_per_cyl"] = df$hp / df$cyl
head(df)

You can also use $ notation
df$new1 = 0
head(df)

Add multiple columns
df[c("new2","new3")] = c(df$cyl, df$wt)
head(df)



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.
5 سال پیش در تاریخ 1398/02/31 منتشر شده است.
34,500 بـار بازدید شده
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