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from mexme - write MEX files in no time by Patrick Mineault
writes fully valid MEX .cpp files including mexFunction boilerplate based on numeric C/C++ snippet

myrecursivefilter(x,alpha)
function [y] = myrecursivefilter(x,alpha)
    y = zeros(size(x));
    y(1) = x(1)*alpha;
    for ii = 2:length(x)
        y(ii) = y(ii-1)*(1-alpha) + x(ii)*alpha;
    end
end

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