maximum of elements
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Hello,
I have a dataset 'a' with 2000 rows and 1 column. I want to create a new dataset 'b' which contains values that are the maximum of the 10 previous rows of 'a'. So row 11 of dataset 'b' has to contain the maximum value of rows 1-10 of dataset 'a' How can I program this?
Thanks, Pieter
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Arnaud Miege
2011-4-5
There may be a cleaner way of doing this the following should work:
b = zeros(size(a));
b(1:10) = a(1:10);
for k=11:length(a)
b(k) = max(a(k-10:k-1));
end
HTH,
Arnaud
更多回答（2 个）
Jan
2011-4-5
If your input is not too large (2000 is no problem), you can expand the data using BUFFER. This is 1300 times faster than NLFILTER and much faster than the loop:
M = max(buffer(a, 10, 9, 'nodelay'))
M = M(:); % BUFFER replies a row vector
b = [a(1:10); M(1:end - 1)];
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