Function for Calculating Moving sum

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

[F.]

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]

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);

[Kaustella Kialain]

what is oneDsignal?

[Stephen23]

In this case oneDsignal is the input data to be smoothed, and the ones(..) term defines the smoothing window.

[Tina Fuhrmann]

Why does it work with conv?

[Image Analyst]

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]

help filter
doc filter

Example: Take a 10 element moving average.

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