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Interpolating random values to smoothen a curve

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Abhiraj Gupta
Abhiraj Gupta on 22 Jul 2019
Commented: TADA on 23 Jul 2019
I need to smoothen curve on this graph and remove the noise in it.I can either use interpolation or curve fitting. I am not able to do it using curve fitting toolbox.How can I do it..??

  1 Comment

KALYAN ACHARJYA
KALYAN ACHARJYA on 22 Jul 2019
Please do share the code. so that members can try on it.

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Accepted Answer

TADA
TADA on 22 Jul 2019
you can implement the stavisky golay filter
basically the idea is to iterate through the data and on each point perform a polynomial fit on a window of several data points arround it, then each point is reoplaced with the value of the polynomial fit in that same point.

  2 Comments

Abhiraj Gupta
Abhiraj Gupta on 23 Jul 2019
Thank you !
order=1;
framelen =3;
for i=1:100
if(i==1)
y = sgolayfilt(data,order,framelen);
else
y = sgolayfilt(y,order,framelen);
end
end
this is giving perfect and smooth curve
TADA
TADA on 23 Jul 2019
In that code you apply the smoothing 100 times on the entire data
This is very intense and it will probably damage your signal
I would apply the smoothing once, but I would use a larger frame
I would also use a higher order fit

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