How to normalize the data?

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Ara 2013-3-14

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https://ww2.mathworks.cn/matlabcentral/answers/67122-how-to-normalize-the-data

评论： Ara 2014-6-14

Hi Everybody,

I have to normalize this data to 0 to have signal intensity in dB. I do not know how to write the code and then plot it.Could you please help me?

L1 CNo (dB-Hz)
15
59
45
33
91
5
1
1
04
56
68
31
54
67
23
28
23
01
76

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Sifiso 2014-6-13

编辑：Sifiso 2014-6-13

Why don't you first normalize the data as is in absolute units, such that your maximum value from your data will now have maximum value = 1. And the rest will be a fraction of 1. i.e Norm_abs = abs( L1 CNo)./max(abs(L1 CNo))

Then you may convert this to dB. 10*log (Norm_abs). All will now be relative to 0 dB and lie below 0dB.

Ara 2014-6-14

Thank you very much for your useful suggestion.

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Answer 1

Honglei Chen 2013-3-14

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https://ww2.mathworks.cn/matlabcentral/answers/67122-how-to-normalize-the-data#answer_78577

编辑：Honglei Chen 2013-3-14

在 MATLAB Online 中打开

If I understand you correctly, say your data is x, you basically want

10*log10(x/max(x))

However, it also looks like your data is already in dB since in the first row it says dB-Hz. In this case, if you want to normalize to 0 dB, you should do

x-max(x)

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Ara 2013-3-14

编辑：Ara 2013-3-14

在 MATLAB Online 中打开

Thanks for your help. Here is the link that show the plot I wish. http://www.sendspace.com/file/78hxof Your code is good but still not set to zero. I tried

x-max(x)
but still not set to zero, actually I want to see the fluctuation by normalize "x" to 0.

Jan 2013-3-14

What should be set to zero?

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How to normalize the data?

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