# r apply function

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 … 3) Example 1: Compute Mean by Group Using aggregate Function. We will learn how to apply family functions by trying out the code. apply (data_frame, 1, function, arguments_to_function_if_any) The second argument 1 represents rows, if it is 2 then the … An apply function is a loop, but it runs faster than loops and often with less code. across.Rd. If n equals 1, apply returns a vector if MARGIN has length 1 … For that, you have two related functions from the apply family at your disposal sapply () and lapply (). The sapply function in R applies a function to a vector or list and returns a vector, a matrix or an array. … across() makes it easy to apply the same transformation to multiple columns, allowing you to use select() … 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. In this tutorial you’ll learn how to apply the aggregate function in the R programming language. 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. The apply () function works on anything that has dimensions in R, but what if you don’t have dimensions? And, there are … 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. We begin by first creating a straightforward list > x=list(1,2,3,4) we use the rapply … You can do this in several ways, depending on the value you specify to the MARGIN … Below are the most common forms of apply functions. 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 … apply() function is the base function. Apply functions are a family of functions in base R, which allow us to perform actions on many chunks of data. R has a more efficient and quick approach to perform iterations – The apply family. The table of content looks like this: 1) Definition & Basic R Syntax of aggregate Function. Apply family in R. The apply family consists of vectorized functions. To call a function for each row in an R data frame, we shall use R apply function. … apply () function in R The apply command in R allows you to apply a function across an array, matrix or data frame.