[R] Summing with NA

[David Winsemius]

On Mar 22, 2010, at 9:51 PM, tj wrote:

>
> Hi all,
> May I request for your help if you have time and if you have an idea  
> on how
> to do this.  I want to add three vectors... And my goal is to obtain  
> the sum
> of the vectors, ignoring the vector of "na"...
>
> Here is what i did in R.. I'm adding the three vectors, e,z,k, and my
> objective is to get an answer = -23.
> I tried putting the na.omit but it did not work.  Thanks.
>
>> z
> [1] -12  -9
>> e
> [1] -2  0
>> k
> [1] NA NA
>> sum(z+e+k)
> [1] NA

?sum  note na.rm and do not use "+".

 > sum(z, e, k, na.rm=T)
[1] -23

>>

David Winsemius, MD
West Hartford, CT