MATLAB: I want to remove the noise of this Signal

filternoisesmooth

Hi there,
I have the following signal, i need to calculate it derivative but it is full of noise.
what should i use to get rid of the noise

Best Answer

If you have R2017a or later, use the smoothdata function: 
D = load('matlab.mat');
Temperature = D.Temperature;
ys = smoothdata( Temperature, 'movmean', 100);                   % R2017a
figure
plot(Temperature, '-b')
hold on
plot(ys, '-r')
hold off
grid
That appears to work well.
EDIT — (24 Apr 2020 at 16:55)
If you have an earlier version/release, this works about as well: 
N = 15;
ys = filter(ones(1,N), N, Temperature - Temperature(1), zeros(1,N-1)) + Temperature(1);
Use those two assignments instead of smoothdata.
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