Trouble with Implementing Moving Average Filter in MATLAB

Question

Hemanshu 2023-6-30

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https://ww2.mathworks.cn/matlabcentral/answers/1990118-trouble-with-implementing-moving-average-filter-in-matlab

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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Answer 1

Chunru 2023-6-30

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https://ww2.mathworks.cn/matlabcentral/answers/1990118-trouble-with-implementing-moving-average-filter-in-matlab#answer_1265143

编辑：Chunru 2023-6-30

在 MATLAB Online 中打开

%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

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Answer 2

Harshavardhan Putta 2023-6-30

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1990118-trouble-with-implementing-moving-average-filter-in-matlab#answer_1265148

在 MATLAB Online 中打开

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);