Ben

Code seems to work great. Thanks.
Is there any way to set the increment size for the x0 range? Allow me to clarify: lets say a have a lower bound of -2 and an upper bound of 2. I want the guesses to increment by 0.1. So effectively, I want to check the values [-2:0.1:2]. Where in your code can I set the 0.1 increment? Also, can that increment be different for each variable in x0?