how to implementing energy function?

i want to implement this above energy function and i tried this following code, but i am getting 'Index exceeds matrix dimensions.' error. How can do this?

e=[];

V=WT.dec{1,1};

for x=1:17

for y=1:19

for z=1:18

e = e + (V(x,y,z))^2;

end

end

end

Answer 1

[Ameer Hamza]

For loop is not needed. Use can use vectorized operation

Sum = sum(V.^2, 'all');

[Mehul Jain]

No not working getting error.

[Ameer Hamza]

What is the error? Please paste complete error message.

Which MATLAB release are you using?

[Mehul Jain]

'Subscript indices must either be real positive integers or logicals.'

[Mehul Jain]

R2016b

[Ameer Hamza]

In MATLAB 2016b, change the line to

Sum = sum(V(:).^2);

[Mehul Jain]

Same error.

[Ameer Hamza]

what about

sum(sum(sum(V.^2)))

[Ameer Hamza]

make sure that no variable sum() is defined in your workspace. run

clear sum

before running the code.

[Mehul Jain]

I am getting again same error.

[Ameer Hamza]

I am not sure about the issue. There seem to be some issue with you MATLAB installation. What is the output of

which sum

[Mehul Jain]

[Ameer Hamza]

Sorry, the correct command was

clear sum

not clear run, I have updated my comment. Try it again.

[Mehul Jain]

Thank you so much it is working.

[Mehul Jain]

I am having some confusion with the other two equations, will u plz help me out ???

[Ameer Hamza]

Please create a new question and paste the link in the comment below. I will try to help.

[Mehul Jain]

https://www.mathworks.com/matlabcentral/answers/517294-how-to-implement-mathematical-functions