I know that when calls R with Sage,the dot will convert to underscores.But even when I set the "system" to R with combo box above in notebook,the dot will convert to underscores,and that is the problem.

shahuwang (May 13 '12)Ah! That was not at *all* clear in the original, but I have edited the original question a little bit to make this clear. I figure that any of the interfaces there will do that, it's an interesting point.

I've opened http://trac.sagemath.org/sage_trac/ticket/13070 for this, though I'm not sure how easy it would be to fix.

kcrisman (May 31 '12)This is now also https://github.com/sagemath/sagenb/issues/103, though it's unclear whether the problem is in Sage or sagenb.

kcrisman (Oct 22 '12)