A variable is a symbol that stands for another value (just like “X” in algebra). We can create a variable by assigning a value to it using the
<- operator. If we then type the name of the variable R will print out its value.
> x <- 4 > x  4
The variable now stands for the value that it contains, so we can perform operations on it and get the same answer as if we used the value itself.
> x + 3  7 > x == 5  FALSE
We can change the value of a variable by simply assigning a new value to it.
> x <- x + 1 > x  5
A note: You can also use the equals sign
= instead of the