function with unspecified unknown variable?

I have an equation as below

 B=sqrt(  (E^2)  *   ( a / b )    );
 

it solves for B if rest are known. This is part of a function.

Now if I wan to find E for given B I have to rearrange the equation, is there an easy and smart way without hardcoding each possibility in a matlab function.

So i wan it to evaluate for any of the unknown given the rest of them.

[Stephen23]

@Sami: are you looking for a numeric solution, or a symbolic solution?

[Samir]

Numerical

Answer 1

[madhan ravi]

doc solve