how to save output of for loop

Hi, I have a matrix A=54×100. For some specific condition I perform an operation on each row of “A” with the help of for loop. now I need to save the output of this for loop. I tried like

 S=zeros(54,100);
for i=1:54;
    Ri=A(i,:);
    answer=mean(reshape(Ri,5,20),1);
    S(i)=answer;
end

but not succeed.

Answer 1

[Alexandra Harkai]

The size of output S in this case will be 54*20. To specify that you want to assign answer to the whole row of S, use the same (i,:) indexing you used for A:

S=zeros(54,20);
for i=1:54;
  Ri=A(i,:);
  answer=mean(reshape(Ri,5,20),1);
  S(i,:)=answer;
end

[Safi ullah]

@ Alexandra Harkai thanks,now the code work well.

[Jan]

+1, correct.

Answer 2

[Jan]

This works without a loop also:

S = squeeze(mean(reshape(Ri, size(A, 1), 5, 20), 2));

[Alexandra Harkai]

+1 for teaching me squeeze

Answer 3

[MARCO FORTI]

Hello all,

I am doing forecasting and the algorithm works fine, nevertheless I can not save the output as I would.

In particular, the final loop is:

%final forecast

ff=zeros(horiz,1);

for i=1:horiz

xf=xb(1:end-i+1,:);

yf=yb(i:end);

betah=(xf'*xf)\(xf'*yf);

ff(i)=y(end-pbest+1:end)'*betah;

th=[th;ff(i)]; %

end

In this I only get the general output as "ans", while I would get the two vector "ff" and "th" both in sequence (as "ans" reports) and separately.

Can anyone help me?