On Wed, May 18, 2011 at 12:24 PM, kcrisman <kcris...@gmail.com> wrote: > On the page you linked to: > "This the documentation for what will be soon the older version of > rpy2. Do consider the upcoming 2.1.x releases if you are starting a > project now." > > If you look at http://rpy.sourceforge.net/rpy2/doc-2.2/html/changes.html > it also seems like in higher-numbered releases there are changes in > this functionality. Maybe this is a known bug; can you try > > from rpy2.robjects.numpy2ri import numpy2ri > ro.conversion.py2ri = numpy2ri > > as on the 2.2 documentation and see if that works.
Nope, not at all. > That said, I never use it - I always use the Sage pexpect interface to > R. But now I will bookmark this worksheet if I get the chance to give > another R/Sage talk! The Sage pexpect is slow and brittle if the size of data you need to move into or out of R is large. The rpy2 interface is much more robust in this regard. But rpy2 is also somewhat weird and wacky, as I learned today. Maybe we need to upgrade the rpy2 in Sage... William > > On May 18, 2:14 pm, William Stein <wst...@gmail.com> wrote: >> Hi, >> >> I was preparing a lecture [1] on rpy2 [2] in Sage (version 4.6.2) and notice >> that the following very important central bit of rpy2 functionality -- >> namely converting a numpy array to R -- seems to be horribly broken: >> >> sage: import rpy2.robjects as robjects # standard >> sage: import rpy2.robjects.numpy2ri # enable automatic >> conversion from numpy to R >> sage: import numpy # make numpy available >> sage: print robjects.r(numpy.array([1,2,3], dtype=float)) # try >> it out; sad result. >> [1] 3 >> >> The output *should* be a vector with 3 entries, I think. >> There are similar problems with numpy arrays. >> >> The same problem happens with 4.7.rc1. >> >> I've never used rpy2 seriously before now, so if I'm just confused, >> can somebody who knows rpy2 better let me know. >> >> -- William >> >> [1] http://flask.sagenb.org/home/pub/57/ >> [2]http://rpy.sourceforge.net/rpy2/doc-2.0/html/numpy.html >> >> -- >> William Stein >> Professor of Mathematics >> University of Washingtonhttp://wstein.org > > -- > To post to this group, send an email to sage-devel@googlegroups.com > To unsubscribe from this group, send an email to > sage-devel+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/sage-devel > URL: http://www.sagemath.org > -- William Stein Professor of Mathematics University of Washington http://wstein.org -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
