R help - May 2009 - is.variable ? is.initialized ?

hi guys,

How do you check if variable is initialized/created, tried :

is.nan(xxx)
is.null(xxx)
is.na(xxx)
exists(xxx)

all of them return :

Error: object "xxx" not found

I need true/false result ?

thanx

On 15/05/2009, at 11:19 AM, myshare wrote:
> hi guys,
>
> How do you check if variable is initialized/created, tried :
>
> is.nan(xxx)
> is.null(xxx)
> is.na(xxx)
> exists(xxx)
>
> all of them return :
>
> Error: object "xxx" not found
>
> I need true/false result ?
exists("xxx") # Note the quote marks; requires the variable name as a
string.

	cheers,

		Rolf Turner

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thanx, I forgot something how then do you check if u have something like this :

exists("xxx$array")

this does not seem to work !! ;\

On Thu, May 14, 2009 at 11:26 PM, Rolf Turner <r.turner at auckland.ac.nz>
wrote:
>
> On 15/05/2009, at 11:19 AM, myshare wrote:
>
>> hi guys,
>>
>> How do you check if variable is initialized/created, tried :
>>
>> is.nan(xxx)
>> is.null(xxx)
>> is.na(xxx)
>> exists(xxx)
>>
>> all of them return :
>>
>> Error: object "xxx" not found
>>
>> I need true/false result ?
>
> exists("xxx") # Note the quote marks; requires the variable name
as a
> string.
>
> ? ? ? ?cheers,
>
> ? ? ? ? ? ? ? ?Rolf Turner
>
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