2D moving sum of a matrix
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Jakob Sievers
el 16 de Ag. de 2020
Comentada: Jakob Sievers
el 16 de Ag. de 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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Respuesta aceptada
Bruno Luong
el 16 de Ag. de 2020
Editada: Bruno Luong
el 16 de Ag. de 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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Más respuestas (1)
Walter Roberson
el 16 de Ag. de 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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