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How to save column means into a data frame in R?
To save column means into a data frame in R, we can follow the below steps −
- First of all, create a data frame.
- Then, find column means using colMeans function and save it in an object.
- After that, use as.data.frame function to save the columns means into a data frame.
Create the data frame
Let's create a data frame as shown below −
x1<-rnorm(20) x2<-rnorm(20) x3<-rnorm(20) df<-data.frame(x1,x2,x3) df
On executing, the above script generates the below output(this output will vary on your system due to randomization): −
x1 x2 x3 1 1.70213769 -0.95244473 2.26375065 2 0.34595513 -1.08072982 1.82237900 3 -2.15140370 0.29371231 0.93618736 4 1.15205917 1.49441646 0.10359977 5 -0.64792396 0.74386152 -0.32052344 6 -0.26708932 1.35840278 0.72028830 7 0.18588536 -0.17686768 -1.49281471 8 -0.68221640 1.01872585 -0.80628351 9 -0.54297612 -0.75439795 0.45718718 10 0.16809064 1.29755557 1.04083405 11 -0.62313149 0.21069186 -0.20507877 12 0.23506147 1.21497276 1.20580838 13 -1.26262129 -0.36575192 0.69571211 14 0.20252970 -0.01855807 2.34383973 15 -0.08076369 1.01931122 -0.83870727 16 -0.34867185 -0.24427371 0.90440007 17 0.72632978 1.20472358 -0.02400482 18 -0.16881666 0.69104113 0.27885659 19 0.11902785 -0.26653054 0.90215258 20 -0.83209119 1.11191470 0.70603749
Find the column means
Using colMeans function to find the column means and saving it in an object −
x1<-rnorm(20) x2<-rnorm(20) x3<-rnorm(20) df<-data.frame(x1,x2,x3) ColMeans_df<-colMeans(df) ColMeans_df
Output
x1 x2 x3 -0.1385314 0.3899888 0.5346810
Save column means in a data frame
Using as.data.frame function to save the column means in a data frame −
x1<-rnorm(20) x2<-rnorm(20) x3<-rnorm(20) df<-data.frame(x1,x2,x3) ColMeans_df<-colMeans(df) as.data.frame.list(ColMeans_df)
Output
x1 x2 x3 1 -0.1385314 0.3899888 0.534681
Updated on: 13-Aug-2021
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