![[BACK]](../../gifs/left.gif)
![[FORWARD]](../../gifs/right.gif)
![[HOME]](../../gifs/home.gif)
![[UP]](../../gifs/index.gif)
![[HELP]](../../gifs/help.gif)
A formula variable is an object that stores a formula expression (unlike a RWV which stores a value) and is bound to that expression using a formula definition. The value of a formula variable is equivalent to the current value of the formula expression that the variable stores. To optimize the computation speed, the formula variable also stores the up-to-date value of the formula expression. So, whenever, the value of the formula variable is referenced, this value is used. The interpreter is responsible for updating this value.
An identifier designating a RWV can be re-used to designate a formula variable and vice versa.