Hi, I have the following problem. I am tried to numerically solve the 1D heat equation for a metal bar of length L. Using the forward time, centered space equation a(t+1) = a(t)+(alpha*deltaA/(deltaX)^2)*(a(x+1,t)-2*a(x,t)+a(x-1,t)) The problem is that I only have ONE heat source at one end of the bar(0), there is nothing at the end of the bar. How do I calculate a(t+1) at L-deltaX? (end of the bar). The above equation is dependent on a(x+1,t), how do I calculate a(t+1,L-deltaX)? Thanks.