How to convert NaN value to 'zero' ?

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Ararat Cetinkaya 2020-3-23

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https://ww2.mathworks.cn/matlabcentral/answers/512514-how-to-convert-nan-value-to-zero

评论： Image Analyst 2020-3-23

Hi Everybody,

I have an equation like this "Enthropy = (-p2/b)*log2(p2/b)". p2 values changing according to another equation and When p2 value gets '0', Enthropy value gets to NaN. is there any way to Conver this NaN to '0' value?

For example

when : p2/b = 4

Enthropy = -4*log2(4) = -8

when : p2/b = 0

Enthropy = -0*log2(0) = 0

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回答（1 个）

darova 2020-3-23

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https://ww2.mathworks.cn/matlabcentral/answers/512514-how-to-convert-nan-value-to-zero#answer_421562

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Use isnan

Enthropy(isnan(Enthropy)) = 0;

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darova 2020-3-23

I don't understand

Image Analyst 2020-3-23

Yes, of course. Why would it not be?

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