Perhaps,
object <- sapply(ls(),
function(x)class(eval(parse(text=x))))
object[grep("character", object)]
--
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O
On 23/09/2007, Zhang Honglian <[EMAIL PROTECTED]> wrote:
>
>
> Hello,
>
> I would like to find all objects of a particular class. Is that
> possible to
> do so in R? I knew that in SPLUS, the function
> objects(class="classname")
> can do this. But in R, I cannot find the similar function to do so. Is
> there
> any way that I can distinguish where an object comes from? E.g. I
> defined a
> class "person". Then I generated three objects from it (e.g, Joe, Lee,
> Dan).
> I also have some other objects in the workspace (not from class
> "person").
> How do I suppose to know in the current workspace I have exactly three
> objects (Joe, Lee, Dan) from the class "person"? For example, in the
> following program, at the final step when I run objects(), it will give
> me
> not only "Joe" ""Lee" and "Dan", but also "x". If I run some other
> programs
> before this, I might have other objects too. How can I let R only give
> me
> "Joe" ""Lee" and "Dan"?
>
> Any help will be highly appreciated,
>
> Honglian
>
> setClass("person",
>
> representation(Name="character",
>
> PhoneNo="character", Address="character"))
>
> setMethod("show", "person",
>
> function(object)
>
> {
>
> x<- data.frame ([EMAIL PROTECTED], [EMAIL PROTECTED],
>
> [EMAIL PROTECTED])
>
> print(x)
>
> }
>
> )
>
> Joe = new("person", Name='Joe', PhoneNo='(210)481-5720', Address='San
> Antonio')
>
> Dan = new("person", Name='Dan', PhoneNo='(413)583-5202',
> Address='Boston')
>
> Lee = new("person", Name='Lee', PhoneNo='(519)837-1291',
> Address='Toronto')
>
> x <- objects()
>
> objects()
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>
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> References
>
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> ______________________________________________
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> PLEASE do read the posting guide
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>
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