 # Counting even numbers from vectror wich contain NA values ?

I've created a vector and set negative values as missing (NA). Now i shoud sum the even numbers from vector, but haven't realised how to do it.

is.double command check's is the vector even?
I've also tried to sum %%2
and the missing values should consider with na.rm=TRUE ?

I would be very gratefull if someone could help me so I would graduate in Schedule Hi,
the `is.double` command test for the double-precision and not if the variable is even or not.
and if you sum directly the `%%2`values, you will only sum the binary result, which correspond to the number of even and not null values.
So, as a solution, firstly, you can apply the sum on the original vector without converting numbers to `NA`, for example:

``````vec = c(-5,4,3,NA,-9,2, NA,1, 20)
sum(vec[vec>0 & !vec%%2], na.rm = T)
``````

in your case, you can do:

``````sum(vec[!vec%%2], na.rm = T)
``````

good luck.

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Thank you, i was quite close but not right yet (sum(!is.na(vec)%%2).

I wish you very nice day!

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I understand now that you want the count and not the sum, you can use:

``````sum( !vec%%2, na.rm = T)
``````
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