bisection method in finding root

This code is a simple root finder with bisection method. What makes it different from other bisection codes is the control mechanism I implemented into it.

You do not need to know where the root stays nor draw in matlab and find it out.
You need only to type an interval and sensitivity element into it. If the root lies outside of the interval, it enhances the search interval by itself. It makes it for some time and still if there is no response, the program suspects of the sensitivity element, 'delta' and asks for a new element to search again.

Here it's...