Converting R variables to sage

edit

Victory! I knew this should be possible.

In the notebook:

%r
a <- c(1,2,3)
a

[1] 1 2 3

from sage.interfaces.r import RElement
b = RElement(r,'a')
c = b._sage_()
c

[1, 2, 3]

and then you can do stuff to c because it's not an RElement.

c[1] = 3
c

[1, 3, 3]

I don't know whether this is worth wrapping slightly better, or if that is even possible. But hopefully this works for you!

If you've done

%r
a <- c(1,2,3)

in one notebook cell. You can just do

r('a')._sage_()

to get back the list [1, 2, 3]. This is a bit easier than using RElement.

You at least have access to them, though only in printed format. Here's a typical example from the worksheet (go to "Edit" to see this, but it looks fine in the notebook).

{{{id=51|
%r
a <- c(1,2,3)
///
}}}

{{{id=52|
%r 
a
///
[1] 1 2 3
}}}

{{{id=58|
r.get('a')
///
'[1] 1 2 3'
}}}

I have a feeling there is another way to do this, though. The key is using _getitem_ but for RElements instead. I haven't quite nailed it down, and I have to go now, but this may be possible.

Probably the easiest way is to write the data out to a file in the R cell and read it in using python in a Sage cell. Make sure to write it out to the DATA directory, which you can find by doing "print DATA" in a Sage cell.