# How to handle NAN when summing

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Robert Demyanovich on 19 Aug 2021
Answered: Eric Sofen on 19 Aug 2021
I have the following code:
for k = 1:N
W(i,k)=W1*(cB(i,k))^W2;
Fluor(i,k)= cB(i,k)*W(i,k)*dx;
end
FL = sum(Fluor(i,1:N),'all');
Sometimes cB(i,k) is equal to zero and because W2 is a negative number this, I guess, ultimately results in Fluor (i,k) equal to NaN. Is there a way to have Matlab insert zero instead of NaN for Fluor(i,k). Ultimately, I'm interested in FL, so an alternative might be to have Matlab skip any values of NaN when summing the row in table Fluor.
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### Accepted Answer

Eric Sofen on 19 Aug 2021
You can pass a flag to sum to 'omitnan'.
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