2D moving sum of a matrix
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Jakob Sievers
le 16 Août 2020
Commenté : Jakob Sievers
le 16 Août 2020
Hi there
How do I perform a moving sum within a matrix? I.e.: the result of each index will be the sum of all surrounding indexes, as defined by window lengths (with some edge effects, as with a regular moving sum).
I could definitely set up some basic loop function but I anticipate having to do this quite often and so I wish to find a smarter/faster solution. And I suspect that there definitely is a smarter solution. Like maybe using filter2 or something?
Thanks in advance for all help!
Cheers
Jakob
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Bruno Luong
le 16 Août 2020
Modifié(e) : Bruno Luong
le 16 Août 2020
Assuming A is your array, w is the window size
% testexample
A=randi(10,5)
movsum(movsum(A,w,1),w,2)
% or
conv2(A, ones(w), 'same')
% or
filter2(ones(w), A, 'same')
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Walter Roberson
le 16 Août 2020
conv2(YourMatrix, ones(WindowHeight, WindowWidth))
You might want to add options such as 'valid' to control the size of output and the edge effects.
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