How to calculate g for the potential method?

Hello,
thank you for your work.

I would like know what is g. Is it the gradient of psi? From you paper i've understood that for the potential method it can be calculated applying Phi(x_i) (end of the page 3293) but in your test.py you wrote:
x=[1/2,1/2]
g=[1.5,1]
which confuse me. Indeed, i don't understand where these such values come from.
Can you explain what the passes were to obtain that g vector?

Thank you.

ps: you wrote x=[1/2,1/2] but for python this list is equal to x=[0,0]. Is it the result that you wanted?