I'm trying to do simple averaging in Simulink and need some help with it.

Question

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.

Expert Answer

John Michell PhD Expert

Answered Nov 20, 2025

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);

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