[graalvm-users] Setting attributes inconsistencies

[Rodrigo Botafogo]

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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