return energy/4. or return energy/2. when calculating energy of Ising model?

[WhymustIhaveaname]

I just found your Ising model blog, which is very good and helped me a lot. However, I think the return energy/4 in function def calcEnergy(config) should be divided by 2 because every link between sites is summed 2 times, not four.

[rajeshrinet]

@WhymustIhaveaname thanks very much for your interest and suggesting a fix. I agree with you that the factor should be 2 instead of 4. I have now fixed the factor.

Best wishes,
Rajesh