For loop for applying filter for each column

4 ビュー (過去 30 日間)
Bharath 2015 年 2 月 17 日
コメント済み: Greig 2015 年 2 月 19 日
Hi I've a signal which I read into matlab as a 4096x28 matrix. I want to apply for loop as follows which will read one column apply the filter and then store the values and then moves to the next column.
X = reshape(T_hor,[],28); % forming 4096x28 matrix
for i = 1:28;
Xnew = X(:,i) - mean(X(:,i)); % filter for DC offset
It just reads the last column (28th) and stops. Is something wrong with my code? Can someone help me to fix this. Thanks in advance.
thanks in advance


Greig 2015 年 2 月 17 日
Xnew is not indexed. You should have Xnew(:, i).
You could do this without the loop. One such way would be...
Xnew = X - repmat(mean(X), 4096, 1);
Another is....
Xnew = detrend(X,0);
I would go with the second (less typing), but either will save you some time in a loop.
  7 件のコメント
Bharath 2015 年 2 月 19 日
編集済み: Bharath 2015 年 2 月 19 日
Thanks a ton. It was very informative and it works perfectly..! :) So is it always good to preallocate before start of a loop? In my previous case I just defined as
ii= 1:28
It just read only the last column but now it seems working perfectly good with the preallocation.
Greig 2015 年 2 月 19 日
Your loop read through all of the columns, but since Xnew was overwritten each time, it only remembered the last loop.


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