public int Neighbours(int i, int j)
{
Spin center = spins[i, j];
int sum = center.GetSpin() *
(spins[Overflow(i + 1), Overflow(j)].GetSpin() +
spins[Overflow(i - 1), Overflow(j)].GetSpin() +
spins[Overflow(i), Overflow(j + 1)].GetSpin() +
spins[Overflow(i), Overflow(j - 1)].GetSpin());
return(sum);
}
public int GetEnergySystem()
{
int sum = 0;
for (int i = 0; i < this.Length; i++)
{
for (int j = 0; j < this.Length; j++)
{
sum += Neighbours(i, j);
}
}
return(-J.GetSpin() * sum);
}
