Smooth data for slowly-sampled data
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Hi,
I have a data sampled slow as blue. I need to obtain the red curve that smoothen out the data. Can anyone please tell me what Matlab command to handle this?
Thanks,
Dave
回答（2 个）
Image Analyst
2020-2-10
0 个投票
Try sgolayfilt() in the Signal Processing Toolbox. That's one way.
See my attached demo.
3 个评论
Dave Lee
2020-2-10
Image Analyst
2020-2-10
How does it lead to phase lag? The window is centered over the point so it uses points both ahead of and behind the signal so the filter value is at exactly the same time point as the original signal. What elements do you want to include when you are getting the smoothed output value at a particular time point?
Hi,
I obtained the following result. I wanted to have the black smoother and tried the red to the level I wanted but it looks lag. Not exactly lag all the time I suppose but some averaging characteristics makes it deviate more from the raw data. The deviation of the black is better.
Thanks, Dave 
Akira Agata
2020-2-10
How about applying interpolation?
The following is an example:
% Original data
time = 1:10;
value = rand(1,10);
% Apply interpolation
time2 = linspace(1,10);
value2 = interp1(time,value,time2,'pchip');
% Visualize the result
figure
scatter(time,value)
hold on
plot(time2,value2)
legend({'Original data','After interpolation'},'FontSize',12)
grid on
box on
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