while loop

You probably going to guess the structure:

    while(condition){
        do something
    }

And... You are going to understand why we saw boolean in the previous section. The idea of the while loop is to say: While condition is TRUE, keep doing 'something'.

Example: while i is lower than 4, display the gene name. Since our vector contains only 4 names, it makes sense isn't it?

> i <- 1
> while(i <= 4){
+ print(gene_names[i])
+ i <- i + 1
+}

Exercise:

• What will happen if I change the condition to i <= 10? (Try to predict the outcome before testing it)
• What will happen if I remove 'i <- i + 1'? (When you will realize what is going on, click the stop button on the top right corner of the console).