Problem with animated line, not drawing anything

I want to plot the value a metric takes while varying the filter sigma value, the code is as follows:

ImgOrg=imread('ROIOriginal_pgm25.png'); %Load the image
for sigmaVal=0.5:0.1:5
    Imed=imgaussfilt(ImgOrg,sigmaVal); %Apply the filter with the sigma value
    [peaksnr, ~] = psnr(Imed, ImgOrg); %Calculate the metric after applying the filter
    h = animatedline;
    addpoints(h,sigmaVal,peaksnr)
    drawnow limitrate
end

But all I get is an empty figure, I can't see any line or any point. I'm in Matlab R2019a.

Answer 1

[Walter Roberson]

Move the

    h = animatedline;

to before the loop.

[Santiago Marin]

Thanks you so much!