Trouble with Implementing Moving Average Filter in MATLAB

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Hemanshu
Hemanshu 2023-6-30
编辑： Chunru 2023-6-30
I am encountering difficulties while trying to implement a moving average filter in MATLAB. I have a code snippet that I believe should work, but I am getting unexpected results. Here is the code snippet that I have tried: %Input data inputData = [1, 2, 3, 4, 5, 6, 7, 8, 9]; windowSize = 3; % Moving average filter implementation filteredData = zeros(size(inputData)); for i = 1:length(inputData) startIndex = max(1, i - windowSize); endIndex = min(length(inputData), i + windowSize); filteredData(i) = mean(inputData(startIndex:endIndex)); end

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回答（2 个）

Chunru
Chunru 2023-6-30
编辑：Chunru 2023-6-30
Ran in:
%Input data
inputData = [1, 2, 3, 4, 5, 6, 7, 8, 9];
windowSize = 3;
% use matlab function
filteredData = movmean(inputData, windowSize)
filteredData = 1×9
1.5000 2.0000 3.0000 4.0000 5.0000 6.0000 7.0000 8.0000 8.5000
% Moving average filter implementation
wS = floor((windowSize-1)/2);
filteredData = zeros(size(inputData));
for i = 1:length(inputData)
startIndex = max(1, i - wS);
endIndex = min(length(inputData), i + wS);
filteredData(i) = mean(inputData(startIndex:endIndex));
end
filteredData
filteredData = 1×9
1.5000 2.0000 3.0000 4.0000 5.0000 6.0000 7.0000 8.0000 8.5000
Harshavardhan Putta
I understand that you're encountering difficulties while implementing a moving average filter in MATLAB. You can use the movmean function in MATLAB to implement a moving average filter. The movmean function calculates the moving average of a given data sequence using a specified window size.
% Input data
inputData = [1, 2, 3, 4, 5, 6, 7, 8, 9];
windowSize = 3;
% Moving average filter implementation using movmean
filteredData = movmean(inputData, windowSize);
disp(filteredData);
Please refer to the following documentation for more information.
https://in.mathworks.com/help/matlab/ref/movmean.html
I hope it helps!

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