[R] result NA , but expected True or False

[David Winsemius]

On Aug 9, 2015, at 8:45 PM, Ragia Ibrahim wrote:

> Dear Group,
> Kindly,
> 
> I have those two lines
> if(  (z_nebla==0) ||  (z_nebla_dash==0) )
>           CM <- 0         else             
> 
>               CM <-  0.5 *(1/a)  +   0.5*(1/b)  
> 
> when running it
> 
> I got this
> 
> z_nebla==0)
> logical(0)
>> (z_nebla_dash==0)
> logical(0)
>> (z_nebla==0) ||  (z_nebla_dash==0)
> [1] NA
> 
> 
> why  (z_nebla==0) ||  (z_nebla_dash==0)
> gives me NA ?

We should instead ask you: why should a logical-OR give anything other than NA when given two length-zero vectors as arguments?

 What value do you expect?

> 
> thanks in advance
> Ragia
> 
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David Winsemius
Alameda, CA, USA