Expression controller examples

[denisT.MaxDoctor]

Can someone provide me with examples of complex expressions used in an expression controller?

I'm not particularly concerned about their practical usefulness. From a technical perspective, I'm primarily interested in their complexity and potential "bulkiness".

thanks

[leeminardi]

@denisT.MaxDoctor any rigging I do that gets complicated I use Script Controllers. but here's an example of a Expression Controller I use for a 4-bar linkage that defines the position of a piston based on the angle of the crank, its radius and the length of the connecting rod.  I wouldn't consider it "complex". 

xpos+crank*sin(radToDeg(alpha)) +sqrt(rod^2- (crank*cos(radToDeg(alpha)))^2)