selecting i element non overlapping subsets of an array of length n

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SSG_newbiecoder
SSG_newbiecoder 2017-12-22
回答： Jos (10584) 2017-12-22
Hello, I have an array of length n. I need to select the first i elements and manipulate it and then take the next non overlapping i elements and apply the same manipulations. how can I do this selection in matlab ?

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采纳的回答

Jos (10584)
Jos (10584) 2017-12-22
or you can use a simple for-loop
A = 1:10
n = 3 ;
N = numel(A) ;
for k=1:n:N
ix = k:min(k+n-1,N) ;
subA = A(ix) ;
disp(subA) ; % process sub array
end
If you have a function to process the data you can also use arrayfun, for instance, like this:
Cout = arrayfun(@(k) myfun(A(k:min(k+n-1,numel(A)))), 1:n:numel(A), 'un',0) ;
% return the outputs of myFun into distinct cells of Cout

更多回答（1 个）

Walter Roberson
Walter Roberson 2017-12-22
If the array is certain to be a multiple of the number of elements you are taking at a time, then use reshape() to convert that size into columns and then you can process by columns.
If the array might not be an exact multiple but you have the Signal Processing Toolbox, then use buffer() to convert it into columns.

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