Why moving average plot is not starting as the original signal

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rohail khan 2018-4-4

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https://ww2.mathworks.cn/matlabcentral/answers/392690-why-moving-average-plot-is-not-starting-as-the-original-signal

评论： Walter Roberson 2018-4-4

Hi, I am trying to analyze a stock data with only two columns i.e dates and value of stocks Both of these columns have length=63.I am trying to calculate the moving average to smooth the curve.I use the following code and get the out put as shown below

window=5;
mask=ones(1,window)/window;
quarter=conv(stocks,mask,'same');
plot(dates,stocks)
hold on
plot(dates,quarter)
ylim([7300,7700])
legend('input data' ,'filtered data')

Why the filtered data curve is not starting from the point where the original input data is starting? How to fix the plot? Is my method to get the moving average right? Is there a better way? thanks

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Answer 1

Walter Roberson 2018-4-4

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You are getting effects from the zero padding. See the 'valid' option instead of 'same'

Or consider using

quarter = movavg(stocks(:), 'simple', window) .';

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rohail khan 2018-4-4

hi, Thank you so much for quick reply. I tried the code but now its giving me the following error: 'Undefined function 'movavg' for input arguments of type 'double'

Please can you explain how to use the 'movavg' function.

Thanks