Create a moving average
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Hi There, How can I calculate a moving average for a column of data. For instance i want to average the 50 points either side of each data point in my column. Thanks
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arman arefi
le 27 Mar 2020
You can use Moving Average Function in the FileExchange. Please find the link below:
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Andrei Bobrov
le 28 Juin 2013
A - your data
L = filter(ones(101,1)/101,1,[A(:) zeros(50,1)]);
out = L(51:end);
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Plus de réponses (5)
Image Analyst
le 28 Juin 2013
Modifié(e) : Image Analyst
le 28 Juin 2013
For a 1D column vector:
movingAverage = conv(yourSignal, ones(101,1)/101, 'same');
For a 2D array of columns:
movingAverage = conv2(yourSignal, ones(101,1)/101, 'same');
If you don't want the central pixel to be included in the average and have ONLY the 50 on either side, use
kernel = ones(101,1)/100;
kernel(51) = 0;
movingAverage = conv(yourSignal, kernel, 'same');
Same for a 2D matrix except use conv2 instead of conv. conv() and conv2() are highly optimized and very fast.
4 commentaires
Nuchto
le 30 Nov 2017
So you could use ones(101,1) first, and onces it is convolved you can divide by 101?
Grzegorz Knor
le 7 Avr 2017
Modifié(e) : Adam Danz
le 19 Sep 2021
1 commentaire
Image Analyst
le 7 Avr 2017
True, and it offers some edge handling options ('shrink', 'discard', 'fill') that conv2() does not have.
conv2() also does not require any toolboxes because it's in base MATLAB.
Marc
le 28 Juin 2013
If you have the financial toolbox, doc movavg()....
[Short, Long] = movavg(Asset, Lead, Lag, Alpha)
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the cyclist
le 28 Juin 2013
This page of the MATLAB documentation has an example of using the filter() command to calculate a moving average:
Jan
le 28 Juin 2013
There are many moving average filters in the FileExchange. Whenever a standard problem occurs, looking in the FEX is a good idea:
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