For Loop inside another Loop

Question

heir ancestors 2017-5-17

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/340674-for-loop-inside-another-loop

评论： KALYAN ACHARJYA 2017-5-25

I am trying to execute a code where I have to set two for loops. So here is the code

for j=1:b
  for i=1:a
      u=@(x) w/2.*cosd(ftilt(i)+(x))-(tand(GamasTday(j)).*(f-(w/2).*sind(ftilt(i)+(x))));
      Bn(i,j)=fsolve(u,ftilt(1));
      end
  end

the problem is with the j , so here j iterating b and which is a 14 elements vector. what I want : take the first value of b for j==1 , do all the iterations for i iterating a which is 10 elements vector from 1 to a , solve and save results and then go back to j+1 , do all the iterations for i from 1 to a and go back again j+1............

the meaninig of the code is not important as the concept of the two loops , blocking the first loop at a value, go to the seconf loop execute all the iterations, go back to the firsst loop second value, go back to the inside loop all iterations .......etc

any ideas ?

thanks

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Answer 1

Geoff Hayes 2017-5-17

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在 MATLAB Online 中打开

If a and b are vectors/arrays and you want to iterate over each element of the array, then you would need to do something like

 for j=1:length(b)
   bVal = b(j);
   for i=1:length(a)
      aVal = a(j);
      % do something
      Bn(i,j)=fsolve(u,ftilt(1));
   end
 end

Note how we need to access an element of either array using i and j before we can start working with it.

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KALYAN ACHARJYA 2017-5-25

It seems OK, in your nesting loops code. As per the code j=1, then do the all iterations of i, when i iterations completed till a, then only j goes to j+1, i does all iterations for j+1...Do you face any problem in your code?

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