n=input('Enter number of grid
points');h=1/(n-1);M=zeros([1,n]);l=input('Enter length of
fin');h=input('Enter convection coeeficient');k=input('Enter
thermal conductivity');disp('1 Variable area fin');disp('2 constant
area rectangular fin');disp('3 constant area traingular
fin');op=input('Enter option number');switch op case 1
A=input('Enter area values for each grid point in a row
vector'); P=input('Enter perimeter values for each grid point
similarly'); disp('The reference values for area and
perimeter is same as that'); disp('of the first grid
point'); for i=1:n
Astar(i)=(A(i)*P(1))/(A(1)*P(i)); end
M(1)=(-Astar(3)+4*Astar(2)-3*Astar(1))/(2*h);
M(n)=(3*Astar(n)-4*Astar(n-1)+Astar(n-2))/(2*h); for
i=2:n-1 M(i)=(Astar(i+1)-Astar(i-1))/(2*h); end
beta=(h*P(1)*l*l)/(k*A(1)); fprintf('value of beta
is %f',beta); case 2 b=input('Enter breadth of
fin'); w=input('Enter width of fin');
peri=2*(b+w); for i=1:n Astar(i)=1; end
beta=(h*peri*l*l)/(k*b*w); fprintf('Value of beta is
%f',beta); case 3 area=input('Enter area of traingular
fin');
side=((4*area)/3^0.5)^0.5;
beta=(h*l*l*3*side)/(k*area); for i=1:n
Astar(i)=1; endendfor i=1:n
X(i)=Astar(i)/(h^2)-M(i)/(2*h);endY=-((2*Astar)/(h*h)+beta);Z=Astar/(h*h)+M/(2*h);Tf=zeros([1,n-1]);disp('T
at first grid point is given to be 1');
