Smoothing just part of the data

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KuriGohan
KuriGohan 2022-4-11
评论： John D'Errico 2022-4-12
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
KALYAN ACHARJYA 2022-4-11
编辑：KALYAN ACHARJYA 2022-4-11
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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KuriGohan
KuriGohan 2022-4-12
yes, thats similar to how i do it now. I just didn't copy to retain original data, i'll add that too. Thank you!

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John D'Errico
John D'Errico 2022-4-11
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?
  2 个评论
KuriGohan
KuriGohan 2022-4-12
Yes that is right, however i have a lot of arrays and i was just wondering if there was a way that is a bit more elegant/requiers less code.
John D'Errico
John D'Errico 2022-4-12
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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