Function for Calculating Moving sum

Question

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Is there any function to calculate moving sum of a vector? I use "smooth" for calculating the moving average of a vector

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F. 2012-7-16

I'm sorry but I don't understand "moving sum of a vector" ... Could you explain it and give a little exemple ? thanks

Answer 1

Image Analyst 2012-7-16

编辑：Image Analyst 2012-7-16

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For a "moving" sum - the sum in a window - you can use conv(), or conv2() in two dimensions:

windowWidth = 15; % or whatever.
movingSum = conv(oneDsignal, ones(1, windowWidth));

for the moving average:

windowWidth = 15; % or whatever.
movingAverage = conv(oneDsignal, ones(1, windowWidth) / windowWidth);

Tina Fuhrmann 2017-10-11

Why does it work with conv?

Image Analyst 2017-10-12

Why wouldn't it? If you replace each element with the average of elements around it, which is what conv() can do, then that's the moving average.

Answer 2

Jonathan Sullivan 2012-7-16

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help filter
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Example: Take a 10 element moving average.

x = rand(1e3,1);
n = 10;
x_moving_average = filter(ones(1,n)/n,1,x);