when dealing with a circle how do you connect the last point with the first point

for i=1:60
    j(i)=i+1
    k(i)=i-1
   if k(i)=0
       k(i)=60
   end
   if j(i)=61
       j(i)=1
   end
    Am(i)=((b*t)/6)*(2+(D(j(i))/D(i)));
    An(i)=((b*t)/6)*(2+(D(k(i))/D(i)));
    Ae(i)=Am(i)+An(i)+Al;
end
Error: File: WebStringer.m Line: 4 Column: 11
The expression to the left of the equals sign is not a valid target for an assignment.

Answer 1

[Image Analyst]

I'm not seeing how that has anything to do with a circle. To create a circle, see the FAQ: http://matlab.wikia.com/wiki/FAQ#How_do_I_create_a_circle.3F

To close or connect an array, tack the first point onto the last point:

x(end+1) = x(1);
y(end+1) = y(1);