How to split data into training/testing sets using sample function

Question

I\'ve just started using R and I\'m not sure how to incorporate my dataset with the following sample code:

sample(x, size, replace = FALSE, prob = NULL)
         


        

Answer 1

I will split 'a' into train(70%) and test(30%)

    a # original data frame
    library(dplyr)
    train<-sample_frac(a, 0.7)
    sid<-as.numeric(rownames(train)) # because rownames() returns character
    test<-a[-sid,]

done