Smoothing just part of the data
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KuriGohan
le 11 Avr 2022
Commenté : John D'Errico
le 12 Avr 2022
I have a 5000x1 array. I'd like to smooth the data from 500:1500 with the function smooth. For now i have created another array 1000x1 with the smoothed data and then overwritten the 500:1500 data in the original array, but is there an easier way to do it?
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KALYAN ACHARJYA
le 11 Avr 2022
Modifié(e) : KALYAN ACHARJYA
le 11 Avr 2022
One way
data=rand(5000,1);
data_smooth=data; % Just copy to retain original data
data_ex=smoothdata(data(500:1500));
data_smooth(500:1500)=data_ex;
You can plot both that data, data & data_smooth to see the difference.
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John D'Errico
le 11 Avr 2022
Um, No. Why should there be?
In fact, extracting the part you want to smooth, and then overwriting that smoothed fragment back into the array seems crystal clear, easy to implement, easy to debug, easy to read, and as fast an any other scheme could be. So why should there be another way?
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John D'Errico
le 12 Avr 2022
So write a little function that does it for you, extracting that segment only, then replacing it after the smooth. Now you can call it as often as you wish. Write the function to take data as an argument, and a second argument that indicates the specific interval. Have it do the smooth and replacement.
This is how MATLAB works. If you want something there is absolutely no general need for, then nobody will have writtten something as specific as this. In that case, you write a function that does it for you.
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