Loop for function with summation up to N-1 and N

I have the function.

How do I write this in MATLAB?

I tried the below, but I don't think it is correct...

Vchain = 0;

for i = 1:N

Vchain = Vchain + 0.5*(D*(y(i)-y(i+1))^2 + (z(i)-z(i+1))^2) + g0*(m*z(i));

end

[Star Strider]

What is ‘D’?

In the image, ‘D’ looks like a function, not a constant. If it is a constant (as you have written it), the multiplication could be written outside the summation.

[yuanb]

In the assignment D = (70/40N) (N/m) and in the fixed part of the given code D = 70.

This was also given Vchain = Vchain + ...;

My code is not working, so something is wrong.

Answer 1

[Youssef Ben Dhiab]

Try this :

Vchain = 0; for i = 1:N-1 Vchain = Vchain + 0.5*D*((y(i)-y(i+1))^2 + (z(i)-z(i+1))^2) + g0*(m*z(i)); end Vchain = Vchain + g0*(m*z(N));