CODEWITHSUNDEEP
matlabfor-loop
Carolin
Carolin

Reputation: 549

For Loop Calculation Matlab does not work

I am trying to calculate the residuals (res) for my 19 time series variables. I expect a (nIndices,:) matrix as an outcome from the calculation. The res calculation works perfectly if applied to 1 individual time series, however it does not work if I try to calculate it with a loop for all time series. It will only calculate res for the first time series (thus I get a 1,: matrix instead of nIndices,:). (The nIndices function correctly calculated 19 time series and was applied in the same editor file many times before).

I would appreciate any hints on what I am missing here. 

for i=1:nIndices  
    res = returns(:,i)-mean(returns(:,i));
end

Upvotes: 0

Views: 46

Answers (1)

brodoll
brodoll

Reputation: 1881

You forgot to iterate over the res variable to store the results. The way it is, it is overwriting the values assigned after each iteration. You should try:

for i=1:nIndices
    res(:,i)=returns(:,i)-mean(returns(:,i));
end

You could also vectorize your approach by using the bsxfun:

res = bsxfun(@minus,returns,mean(returns,1));

Upvotes: 1

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