R help - Jan 2004 - Detect the presence of an object

Is there a  function like "is.there" such that 

is.there ( a ) returns TRUE is object 'a' is in the current environment
and
FALSE otherwise?

Thank you.
Francisco J. Molina

On Fri, 2004-01-30 at 14:58, Francisco J Molina wrote:
> Is there a  function like "is.there" such that 
> 
> is.there ( a ) returns TRUE is object 'a' is in the current
environment and
> FALSE otherwise?
> 
> Thank you.
> Francisco J. Molina

See ?exists

This requires that the object of interest is quoted:
> a <- "I am here"
> exists(a)
[1] FALSE
> exists("a")
[1] TRUE

There are other arguments to the function to indicate where to search,
etc.

HTH,

Marc Schwartz

> Is there a  function like "is.there" such that 
> is.there ( a ) returns TRUE is object 'a' is in the current
environment and
> FALSE otherwise?
exists()

try the function exists()

On Fri, 30 Jan 2004, Francisco J Molina wrote:
>
> Is there a  function like "is.there" such that
>
> is.there ( a ) returns TRUE is object 'a' is in the current
environment and
> FALSE otherwise?
>
> Thank you.
> Francisco J. Molina
>
> ______________________________________________
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> https://www.stat.math.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html
>
>
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e-mail: pj at est.ufpr.br
http://www.est.ufpr.br/~paulojus

Have you considered "exists" or "missing"? 

      hope this helps.  spencer graves

Francisco J Molina wrote:
>Is there a  function like "is.there" such that 
>
>is.there ( a ) returns TRUE is object 'a' is in the current
environment and
>FALSE otherwise?
>
>Thank you.
>Francisco J. Molina
>
>______________________________________________
>R-help at stat.math.ethz.ch mailing list
>https://www.stat.math.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html
>  
>

Francisco J Molina wrote:
> Is there a  function like "is.there" such that 
> 
> is.there ( a ) returns TRUE is object 'a' is in the current
environment and
> FALSE otherwise?
?exists

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On 30 Jan 2004 at 12:58, Francisco J Molina wrote:
> 
> Is there a  function like "is.there" such that 
> 
> is.there ( a ) returns TRUE is object 'a' is in the current
> environment and FALSE otherwise?
Have you tried exists("a", inherits=FALSE) ?

- Torsten

Francisco J Molina <fjmolina at ams.ucsc.edu> writes:
> Is there a  function like "is.there" such that 
> 
> is.there ( a ) returns TRUE is object 'a' is in the current
environment and
> FALSE otherwise?
exists("a",inherits=FALSE)

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