Hi!
The reason for the error "Index exceeds matrix dimensions." in your piece of code is because U is an array of size 51 x 3 but you are trying to use 'limit' which range from 1400 to 1500 to index into U.
U(a,b) % will be valid only if a<52 and b<4 where a and b are positive integers OR Logicals.
In cases of trivial issues like this, I would suggest you to try debugging using breakpoints in MATLAB.
Read more about this at: https://www.mathworks.com/help/matlab/matlab_prog/debugging-process-and-features.html
Hope this helps.
Regards,
Jyotish
