how i can change the explicit code to implicit code?

hi ....i have wrriten explicit code in matlab but i wanna turn to implicit so i need help in this.

here's the explicit code

clc
clear all
c=490;
k=54;
p=7800;
dt=3;
dx=0.01;
alpha=k/(p*c);
lamda=alpha*dt/dx^2;
for n=1:4
    T(n,1)=100;
    T(n,6)=25;
end
for i=2:5
    T(1,i)=20;
end
for n=1:3
    for i=2:5
        T(n+1,i)=lamda*(T(n,i-1)-2*T(n,i)+T(n,i+1))+T(n,i)
    end
end
for i=1:6
    x(i)=(i-1)*0.01;
end

Answer 1

[gonzalo Mier]

function [T,x] = example(c,k,p,dt,dx)
alpha=k/(p*c);
lamda=alpha*dt/dx^2;
for n=1:4
    T(n,1)=100;
    T(n,6)=25;
end
for i=2:5
    T(1,i)=20;
end
for n=1:3
    for i=2:5
        T(n+1,i)=lamda*(T(n,i-1)-2*T(n,i)+T(n,i+1))+T(n,i)
    end
end
for i=1:6
    x(i)=(i-1)*0.01;
end
end

[gonzalo Mier]

Accept the answer if it worked for you! :)