How to use ave() function In R Language

Method 2: Using mutate() function from dplyr package

Call the ave() function, which is a base function of the R language, and pass the required parameters to this function and this process will be leading to the numbering rows within the group of the given dataframe in the R programming language.

ave() function is used for subsets of x[] are averaged, where each subset consist of those observations with the same factor levels.

Syntax:

ave(x, …, FUN = mean)

Parameters:

x: A numeric.

… : Grouping variables, typically factors, all of the same length as x.

FUN: Function to apply for each factor level combination

Example: Numbering rows within groups

R

gfg<-data.frame(x=1:20,group=c(rep("g1", 8), 
                               rep("g2", 5), 
                               rep("g3",4), 
                               rep("g4",3))) 
  
gfg$numbering <- ave(gfg$x,gfg$group,FUN = seq_along) 
  
gfg