How do i get matlab to break from a nested loop but then go back into the loop?

So ill try to be as clear as i can

Im basically trying to do a double summation here.

The problem is there are two variables that must advance at the same time.

When i use break it kicks me out of my inner loop goes outside, continues the outer one but never gets back to the inner one?

What do i do?

count = 0

sum = 0

for N = [-5,-4,-3,-2,-1,0,1,2,3]

      for X = [3,1,-5,-11,0,-5,3,3,8]
          sum = sum + X*exp(-j*pi*N)
          %count was used just for debugging to see things line by line
          count = count + 1
          break

      end

end

disp(sum);

So as you can see from my code for the first run through N = -5 It should go to the next loop where X = 3 and make a calculation. then it should break out of that loop and return to the top. Index N up so it now = -4 and then go back to my inner for loop where X should = 1 and continue calculation.

However whoever i try to use break it never goes back to the inner loop and just keeps advancing the outer loop without doing anything.

Also can someone tell me how to set up matlab to debug line by line like a C code

Answer 1

[Walter Roberson]

Nvals = [-5,-4,-3,-2,-1,0,1,2,3];
XVals = [3,1,-5,-11,0,-5,3,3,8];
total = 0;
for idx = 1 : length(Nvals)
  N = Nvals(idx)
  X = Xvals(idx)
  total = total + X*exp(-j*pi*N)
end

Or more simply

N = [-5,-4,-3,-2,-1,0,1,2,3];
X = [3,1,-5,-11,0,-5,3,3,8];
total = sum(X .* exp(-j*pi*N));

[Robert]

Thank you very much

Can you show me the syntax to access the a certain index of the array?

I assume they start at 0 like C language?

[Robert]

I tried your second version but it keeps giving me an error about subscript indices? any ideas?

[Robert]

I got your first version working, there was just a small typo that was giving me an error.

Thank you so much for your help. I will put that trick in the back of my brain for next time