[R] equivalent of ifelse

[Márcio Resende]

David Winsemius wrote:
> 
> 
> On Dec 9, 2009, at 12:40 PM, carol white wrote:
> 
>> Hi,
>> Is there any equivalent for ifelse (except if (cond) expr1 else  
>> expr2) which takes an atomic element as argument but returns vector  
>> since ifelse returns an object of the same length as its argument?
>>
>> x = c(1,2,3)
>> y = c(4,5,6,7)
>> z = 3
>>
>> ifelse(z <= 3,x,y)
>>
>> would return x and not 1
> 
> I worry that this is too simple, so wonder if you have expressed your  
> intent clearly.
> 
>  > if(z <= 3) {x} else {y}
> [1] 1 2 3
>>
> 
> I was wondering David, why is the {} necessary?
> if(z <= 3) x else y 
> [1] 1 2 3
> 
> since without {} it cames with the same result?
> 
> Thanks
> MR.
> 
> 
> 
> David Winsemius, MD
> Heritage Laboratories
> West Hartford, CT
> 
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> 

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