How to smooth and normalize noisy data

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Felix Obite 2022-9-18

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https://ww2.mathworks.cn/matlabcentral/answers/1807380-how-to-smooth-and-normalize-noisy-data

评论： Star Strider 2022-9-18

normal_data.png

I plotted sumrate against number of iterations but my data is very noisy. I need a smooth PDF, how can I smooth and normalize the attached noisy data. Thanks.

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Chunru 2022-9-18

doc smoothdata

Felix Obite 2022-9-18

i need to improve on this, have tried several smoothing function.

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Answer 1

Star Strider 2022-9-18

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I have no idea what result you want.

One option is the filloutliers function (or similar functions) and another is the Signal Processing Toolbox sgolayfilt function to do broadband filtering.

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Felix Obite 2022-9-18

编辑：Felix Obite 2022-9-18

hi, i tried sgolayfilt function, but got error message. so I used the following function:

pro_position = [451 461 913 271];

smooth_rate = 0.01; % other pdfs with less smoothing

h = figure;

h.Position = pro_position;

plot(i,smooth(x, smooth_rate))

And this is the best I could get. I need to improve the convergence plot.

Star Strider 2022-9-18

It would be interesting to see your sgolayfilt call. I usually use a degree 3 polynomial, begin with a frame length that is about 5% of the length of the vector, and then adjust the framelength until I get the result I want.

There are several smooth functions. I have no idea which one you are referring to.

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Answer 2

KALYAN ACHARJYA 2022-9-18

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https://ww2.mathworks.cn/matlabcentral/answers/1807380-how-to-smooth-and-normalize-noisy-data#answer_1055750

Please check the smoothdata Matlab function

https://in.mathworks.com/help/matlab/ref/smoothdata.html

it can smooth the data in number of ways, note that the trade-off between the actual data points and the averaged data points should be within the acceptable level.