I'm trying to do simple averaging in Simulink and need some help with it.
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Guillermo
on 9 Nov 2011
Answered: Martin Murtagh
on 23 Mar 2021
Assume AI'm acquiring a noisy signal at 1 mS interval and I want to get 1 point every 50 mS. I would like to collect the data for the 50 mS and spit out an average for logging. I'm not sure how to do it.
Any simple solutions would be appreciated.
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Accepted Answer
Alexander Bottema
on 9 Nov 2011
function y = my_average(u) %# codegen
persistent i buf bufSum;
if isempty(buf)
buf = zeros(1,50);
bufSum = 0;
i = 1;
end
bufSum = bufSum - buf(i);
buf(i) = u;
bufSum = bufSum + u;
i = i + 1;
if i > numel(buf)
i = 1;
end
y = bufSum / numel(buf);
More Answers (4)
Fangjun Jiang
on 9 Nov 2011
Use the "Weighted Moving Average" block from Simulink>Discrete, click help for details.
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Fangjun Jiang
on 9 Nov 2011
Hah, it is obsolete! http://www.mathworks.com/help/toolbox/simulink/ref_obsolete_blocks/weightedmovingaverageobsolete.html
Use the new Discrete FIR Filter, http://www.mathworks.com/help/toolbox/simulink/slref/discretefirfilter.html
Walter Roberson
on 9 Nov 2011
Feed the signal in to an integration block that is reset to 0 every 50 samples; take the 50th output and divide it by 50 to get the average for that period.
There might be a cleaner way to only trigger the output collection every 50 outputs and tie that in to the integration block being cleared right afterwards.
Martin Murtagh
on 23 Mar 2021
I have replaced the moving average block in my models with the subsystem shown. By setting the delay length to the moving average value divided by the time-step and the gain value to one over the moving average value, this subsystem will calcuate the moving average in the same way as the moving average function with a sliding window.
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