sliding window in a vector
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Hey guys, I need help in designing a sliding window. In fact, I have a data matrix that it has 82 rows and 600 column, The column related to time. I want to collect the new 82*1 vector in a new sample and add it to my data matrix and remove the first column of the matrix. So, the size of matrix should be the same as before. I don't want to use loops for this issue. Do I have any other way to solve the problem??
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Walter Roberson
2011-10-31
Simple code:
A = [A(:,2:end), newdata(:)];
Code that might possibly require more computation work but is possibly more efficient in memory:
A(:,1:end-1) = A(:,2:end);
A(:,end) = newdata(:);
更多回答（1 个）
Wayne King
2011-10-31
Hi, I'm not certain exactly what you asking for here. It seems to me you want to advance the columns by 1 and replace the first column with the new 82x1 data vector. In what follows, imagine A is your existing data and newdata is the new data vector.
A = randn(82,600);
newdata = randn(82,1);
B = circshift(A,[0 1]);
B(:,1) = newdata;
2 个评论
Walter Roberson
2011-10-31
My interpretation is that the first column is shifted out and the new data is put in the last column.
iman102
2011-10-31
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