[R] Summing with NA
Alain Guillet
alain.guillet at uclouvain.be
Wed Mar 24 17:43:25 CET 2010
Hi,
Do help(sum) to find more information about the option na.rm=T
> sum(c(z,e,k),na.rm=T)
[1] -23
Alain
On 24-Mar-10 17:21, Muhammad Rahiz wrote:
> Slightly longer method, but works as well.
>
> z <- c(-12,-9)
> e <- c(-2,0)
> k <- c(NA,NA)
>
> x <- c(z,e,k)
> x1 <- which(x!="NA",arr.ind=TRUE) # get elements which are not NA
> x2 <- x[x1]
>
> sum(x2)
> [1] -23
>
> --
> Muhammad
>
>
>
>
>
> 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
>>
>>
>
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--
Alain Guillet
Statistician and Computer Scientist
SMCS - IMMAQ - Université catholique de Louvain
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