![]() ![]() In the program below, which(sapply(dat, is.numeric)) makes sure loop runs only on numeric variables.įor (i in which(sapply(dat, is. It's become a daunting task if you don't know how to write a loop. Suppose you are asked to impute Missing Values with Median in each of the numeric variable in a data frame. The program below creates multiple data frames based on the number of unique values in variable Species in IRIS dataset.įor (i in 1:length(unique(iris$Species))) ![]() The seq_along finds out what to loop over.Įxample 2 : Split IRIS data based on unique values in "species" variable The vector function can be used to create an empty vector. What Is a For-Loop in R A for-loop is one of the main control-flow constructs of the R programming language. The above FOR LOOP program can be written like the code below. The length function could also be used to know the number of column. Next step is to define the number of columns for which loop over would be executed. Prior to starting a loop, we need to make sure we create an empty vector. This concept is not new and it has been in the programming field over many years. ![]() It is similar to FOR LOOP in other languages such as VB, python etc. The for loop in R, also known as for cycle, is a repetitive iteration in loop of any code, where at each iteration some code is evaluated through the elements of a list or vector. Like apply family of functions, For Loop is used to repeat the same task on multiple data elements or datasets.
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