Create a moving average
41 views (last 30 days)
Show older comments
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
1 Comment
arman arefi
on 27 Mar 2020
You can use Moving Average Function in the FileExchange. Please find the link below:
Accepted Answer
Andrei Bobrov
on 28 Jun 2013
A - your data
L = filter(ones(101,1)/101,1,[A(:) zeros(50,1)]);
out = L(51:end);
0 Comments
More Answers (5)
Image Analyst
on 28 Jun 2013
Edited: Image Analyst
on 28 Jun 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 Comments
Nuchto
on 30 Nov 2017
So you could use ones(101,1) first, and onces it is convolved you can divide by 101?
Grzegorz Knor
on 7 Apr 2017
Edited: Adam Danz
on 19 Sep 2021
1 Comment
Image Analyst
on 7 Apr 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
on 28 Jun 2013
If you have the financial toolbox, doc movavg()....
[Short, Long] = movavg(Asset, Lead, Lag, Alpha)
0 Comments
the cyclist
on 28 Jun 2013
This page of the MATLAB documentation has an example of using the filter() command to calculate a moving average:
Jan
on 28 Jun 2013
There are many moving average filters in the FileExchange. Whenever a standard problem occurs, looking in the FEX is a good idea:
0 Comments
See Also
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!