For that, you have two related functions from the apply family at your disposal sapply () and lapply (). … R has a more efficient and quick approach to perform iterations – The apply family. apply(data, 1, function(x) {ifelse(any(x == 0), NA, length(unique(x)))}) #  1 NA 2 Basically ifelse returns a vector of length n if its first argument is of length n. You want one value per row, but are passing more … The table of content looks like this: 1) Definition & Basic R Syntax of aggregate Function. An apply function is a loop, but it runs faster than loops and often with less code. We begin by first creating a straightforward list > x=list(1,2,3,4) we use the rapply … Apply functions are a family of functions in base R, which allow us to perform actions on many chunks of data. Below are the most common forms of apply functions. across() makes it easy to apply the same transformation to multiple columns, allowing you to use select() … … apply() function takes 3 arguments: data matrix; row/column operation, – 1 for row wise operation, 2 for column wise operation; function to be applied on the data. The sapply function in R applies a function to a vector or list and returns a vector, a matrix or an array. Apply family in R. The apply family consists of vectorized functions. You can do this in several ways, depending on the value you specify to the MARGIN … apply() function is the base function. And, there are … The apply () function works on anything that has dimensions in R, but what if you don’t have dimensions? We will learn how to apply family functions by trying out the code. across.Rd. rapply stands for recursive apply, and as the name suggests it is used to apply a function to all elements of a list recursively. The function has the following syntax: The function has the following syntax: sapply(X, # Vector, list or … If n equals 1, apply returns a vector if MARGIN has length 1 … apply () function in R The apply command in R allows you to apply a function across an array, matrix or data frame. apply (data_frame, 1, function, arguments_to_function_if_any) The second argument 1 represents rows, if it is 2 then the … To call a function for each row in an R data frame, we shall use R apply function. If each call to FUN returns a vector of length n, and simplify is TRUE, then apply returns an array of dimension c(n, dim(X)[MARGIN]) if n > 1. In this tutorial you’ll learn how to apply the aggregate function in the R programming language. Apply a function (or a set of functions) to a set of columns Source: R/across.R. when 1 is passed as second parameter, the function … 2) Creation of Example Data. 3) Example 1: Compute Mean by Group Using aggregate Function.