[R] a small puzzle?

[Alain Guillet]

  In an if statement, you can use only elements. In your example, news1o 
and s2o are vectors so there is a warning saying the two vectors have a 
bigger length than one.

If you don't send two messages about the same problem in two minutes, 
you can see what people answer you... For example, I advised you to use 
ifelse which works on vectors.


Alain


On 12-Jul-10 16:02, Raghu wrote:
> I know the following may sound too basic but I thought the mailing list is
> for the benefit of all levels of people. I ran a simple if statement on two
> numeric vectors (news1o and s2o) which are of equal length. I have done an
> str on both of them for your kind perusal below. I am trying to compare the
> numbers in both and initiate a new vector s as 1 or 0 depending on if the
> elements in the arrays are greater or lesser than each other. When I do a
> simple s=(news1o>s2o) I get the values of S as a string of TRUEs and FALSEs
> but when I try to override using the if statements this cribs. I get only
> one element in s and that is a puzzle. Any ideas on this please? Many
> thanks.
>
>
> if(news1o>s2o)(s<-1) else
> + (s<--1)
> [1] -1
> Warning message:
> In if (news1o>  s2o) (s<- 1) else (s<- -1) :
>    the condition has length>  1 and only the first element will be used
>> s
> [1] -1
>> length(s)
> [1] 1
>   str(news1o)
>   num [1:3588] 891 890 890 888 886 ...
>> str(s2o)
>   num [1:3588] 895 892 890 888 885 ...
>
>
>
>

-- 
Alain Guillet
Statistician and Computer Scientist

SMCS - IMMAQ - Université catholique de Louvain
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