Great! So far, you know how to create a vector, assign names to values, and extract elements from it. The next thing we will consider is modifying: adding and deleting existing items from a vector.

There are at least two ways to add a new value to an existing vector. Assume we have a vector named vec and want to add new_value to it. The name we want to assign to this value is 'new_name'. Both ways are displayed on the schema below.

For example, let me show you how both ways will work. Let's use the same grades example and add a new grade 60 for the 'Philosophy' subject. The first way is using vectors:

Now let's perform the second method - assigning names with values simultaneously.

So, if your vector has no names, then the first method is better. But if the vector has names - then it's better to use the second method. Using the second method, you can add new values and reassign them. For example, if you write grades['Math'] <- 100 - then the original value of 80 will be rewritten with 100. Also, you can refer to a specific index. The same trick can be done by writing grades[1] <- 100.