[graalvm-users] Setting attributes inconsistencies

[Chris Seaton]

Maybe this is something to do with the `dim<-` method? I don’t know anything about R but I guess that’s called when you do `names(something) =`. Can you try making a simple test case that just tests that these kind of methods can be called correctly? Maybe something about it messes up the arguments?

Chris

> On 6 Jul 2018, at 17:41, Rodrigo Botafogo <rodrigo.a.botafogo at gmail.com> wrote:
> 
> Hello,
> 
> I'm trying to set attributes to an r object using interop.  For some attributes everything works fine and for others the attribute is not set.
> 
> Here what I'm trying in R:
> 
> R.eval(<<-R)
>   vect = c(1, 2, 3, 4, 5, 6);
>   names(vect) = c("a", "b", "c", "d", "e", "f");
>   print(vect);
>   dim(vect) = c(3, 2);
>   print(vect)
> R
> 
> The first print show the names set:
> 
> a b c d e f 
> 1 2 3 4 5 6 
> 
> and the second print shows the dimension change.  Changing the "dim"
> attribute erases the names attribute:
>      [,1] [,2]
> [1,]    1    4
> [2,]    2    5
> [3,]    3    6
> 
> Now, doing this using interop:
> 
> # pp to allow printing: already reported bug
> pp = Polyglot.eval("R", "function(x) print(x)")
> 
> vec = Polyglot.eval("R", "c").call(1, 2, 3, 4, 5, 6)
> nams = Polyglot.eval("R", "c").call("a", "b", "c", "d", "e", "f")
> Polyglot.eval("R", "`names<-`").call(vec, nams)
> pp.call(vec)
> 
> this prints as expected the vector with the names attribute:
> 
> a b c d e f 
> 1 2 3 4 5 6 
> 
> dims = Polyglot.eval("R", "c").call(3, 2)
> Polyglot.eval("R", "`dim<-`").call(vec, dims)
> pp.call(vec)
> 
> a b c d e f 
> 1 2 3 4 5 6 
> 
> method dim<- does not seem to  have worked.  There is no error message or anything after calling `dim<-`
> 
> Is this a bug or did I do something wrong here?  Its strange that some attributes work and others don't.
> 
> 
> 
> 
> -- 
> Rodrigo Botafogo
> 
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