Notice that %do% operator after the loop definition, I’ll talk more about it later. The foreach version returns a list with the results automatically. Another interesting example will be writing. Notice that I have to create a vector x to gather the results before executing the loop. It is an entry controlled loop, in this loop the test condition is tested first, then the body of the loop is executed, the loop body would not be executed if the test condition is false. Check out these examples to learn more about for loop: Find the Factorial of a Number. It means, the for loop can be used to execute a group of statements repeatedly depending upon the number of elements in the object. We can see that x contains 3 even numbers. The foreach package (the vignette is here) provides a way to build loops that support parallel execution, and easily gather the results provided by each iteration in the loop.įor example, this classic for loop computes the square root of the numbers 1 to 5 with sqrt() (the function is vectorized, but let’s conveniently forget that for a moment). For loop in R Programming Language is useful to iterate over the elements of a list, dataframe, vector, matrix, or any other object.
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