R help - Jun 2009 - how to make the dynamically creted string work inside if as a condition

Hi,
How to make an if condition work,  if the condition inside if() is created
dynamically  ,and that is a string .If i type teh dynamically created string
the if works fine but when dynamically created,it is a string and going
inside the if() ,an error is thrown saying : rgument is not logical ..I even
tried changing teh mode of the string to logical,but it doesn't work

Say my dynamically created string is :--

str<- name=='tom' || name=='harry' || name=='tina'
where the names are diffrent for diffrent DBs.

if(name=='tom' || name=='harry' || name=='tina' )
{
 some code
}

If i do this
if(str)
{

 some code
}

It doesn't work:(
-- 


Thanks
Moumita

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Moumita Das wrote:
> Hi,
> How to make an if condition work,  if the condition inside if() is created
> dynamically  ,and that is a string .If i type teh dynamically created
string
> the if works fine but when dynamically created,it is a string and going
> inside the if() ,an error is thrown saying : rgument is not logical ..I
even
> tried changing teh mode of the string to logical,but it doesn't work
>
> Say my dynamically created string is :--
>
> str<- name=='tom' || name=='harry' ||
name=='tina'
> where the names are diffrent for diffrent DBs.
>   
That's not a string, it will be evaluated to a logical TRUE or FALSE
value.
> if(name=='tom' || name=='harry' || name=='tina' )
> {
>  some code
> }
>
> If i do this
> if(str)
> {
>
>  some code
> }
>
> It doesn't work:(
>   
Those should be equivalent.  I think you need to simplify your example 
and post real code for us to see the problem.

Duncan Murdoch