How to use ransac.m function, please give me a small example

Recently I got a function name ransac, but I cant use it because I cant understand the arguments of that function. Here is the link of that function http://www.csse.uwa.edu.au/~pk/Research/MatlabFns/Robust/ransac.m

If any one have experience to use it please give me a small example to call the function. My data is 2 dimensional and my fitting function is exponentional.

Thanks Sumon