How to make smooth curve on figure?
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I have a matlab figure which has noisy data. I want to plot a smooth curve for those data. Can anyone help on this issue?
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Star Strider
on 6 Apr 2015
The Savitzky-Golay filter (Signal Processing Toolbox sgolayfilt function) is probably best for your application:
F = openfig('smooth.fig');
x = get(get(gca, 'Children'), 'XData');
y = get(get(gca, 'Children'), 'YData');
x = x(~isnan(y));
y = y(~isnan(y));
b = sgolayfilt(y, 3, fix(length(y)/2));
hold on
plot(x, b, '-r')
hold off
Experiment with the filter polynomial order and frame length to get the result you want.
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