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# R append() Function - Add Elements [ R Language Examples](https://example.com/r/r-examples.html) The R append() function is used to insert elements into a vector. append() can insert new elements at a specified position in a vector, which is more flexible than directly using c() concatenation. The syntax of the append() function is as follows: append(x, values, after = length(x)) **Parameter Description:** * **x**: The original vector. * **values**: The elements to add. * **after**: The insertion position (after which index), default is at the end. ## Example x <-c(1, 2, 3, 4, 5) # Append at the end result1 <-append(x, c(6, 7)) print("Append at end:") print(result1) # Insert after specified position result2 <-append(x, c(9, 9), after =2) print("Insert after 2nd element:"); print(result2) # Insert at the beginning (after = 0) result3 <-append(x, 0, after =0) print("Insert at beginning:"); print(result3) Executing the above code outputs the following result: "Append at end:" 1 2 3 4 5 6 7 "Insert after 2nd element:" 1 2 9 9 3 4 5 "Insert at beginning:" 0 1 2 3 4 5 append() is very useful when dynamically building vectors: ## Example # Dynamically collect data that meets conditions all_numbers <-1:20 result <-c()# Empty vector for(num in all_numbers){ if(num %%3==0){## Divisible by 3 result <-append(result, num) } } print("Numbers divisible by 3:"); print(result) Executing the above code outputs the following result: "Numbers divisible by 3:" 3 6 9 12 15 18 [ R Language Examples](https://example.com/r/r-examples.html)