saving all for loop outputs

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amna chaudhary 2018-4-15

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/395036-saving-all-for-loop-outputs

编辑： Geoff Hayes 2018-4-15

I have the following code for which I want to store all the outputs in an excel file. However when i try to do so i only get the last output of for loop. PLEASE HELP

seq = [];
seq2 = [];
aa = ['A', 'R', 'D'];
bb = perms(aa);
c = cellstr(bb);
d = char(c);
for j = 1:length(d)
      if d(1,1) == 'A'
          seq = [seq, A(1)];
      elseif d(1,1) == 'R'
          seq = [seq, R(1)];
      elseif d(1,1) == 'D'
          seq = [seq, D(1)];
      end
      if d(1,2) == 'A'
          seq = [seq, A(2)];
      elseif d(1,2) == 'R'
          seq = [seq, R(2)];
      elseif d(1,2) == 'D'
          seq = [seq, D(2)];
      end
      if d(1,3) == 'A'
          seq = [seq, A(3)];
      elseif d(3) == 'R'
          seq = [seq, R(3)];
      elseif d(1,3) == 'D'
          seq = [seq, D(3)];
         seq = [];
      end
  seq;
  seq2 = prod(seq)
  end

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Rik 2018-4-15

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You forgot to index your output. Your loop variable is used nowhere in your loop, so it repeats the same calculation each and every time.

What is it you want to do? Which variable do you want to index? A small example of how to create a loop that saves its output for every iteration is the code below.

a=zeros(10,1);%pre-allocate a vector to store results
for n=1:numel(a)
    data=rand(1,4);%generate random data
    data=sum(data);%do something with that data
    a(n)=data;%store it in the vector
end