clc;
clear;
//coeficientes
TD = 10;
TE = 40;
TINI = 25;
L=1;
alpha = 40;
celulas = 5;
dt = 0.1;
dx = L/celulas;
S = (alpha*dt)/(dx*dx);
B=0.5;
Tnova(1) = TE;
Tnova(celulas) = TD;
Tvelha(1)= TE;
Tvelha(celulas)= TD;
t=0
tmax=400;
totalit=0;
tolerancia=0.000000001;

for i=2:i<celulas
    Tnova(i)=TINI;
    Tvelha(i)=TINI;
end


while(t<tmax)

    for totalit=0:totalit<=1000

        for i=2:i<celulas {
            Taux = (S*B*(Tnova(i-1)+Tnova(i+1))+s(1-B)(Tvelha(i+1)+Tvelha(i-1)+Tvelha(i)+2*S*(1-B)*Tvelha(i)))/(1+2*S*B);
            erro=max(erro,ABS(Taux-Tnova(i));
            Tnova(i) = Taux;}

        end

        if (erro<tolerancia) then
            break;
        end
        totalit=totalit+1;
     end