Hello Ding, It appears that either you don't have numpy properly installed, or that your copy of rpy was compiled without numpy support.
A simple workaround for this specific case would be to turn of conversion of r to python objects, so that the object 'x' remains an r matrix, rather than being converted into a python list object (if numpy was being properly used, the return object would be a numpy matrix). Try this code: from rpy import * set_default_mode(NO_CONVERSION) x = r.matrix(r.rnorm(100), 50, 2) # returned as an R object km_1 = r.kmeans(x, 2) r.print_(km_1) # returned and converted to a python object set_default_mode(BASIC_CONVERSION) km_2 = r.kmeans(x, 2) print km_2 -Greg On Feb 22, 2008, at 5:40PM , Ding Zhou wrote: > Hi, > > I was trying get the rpy to work but was stuck. Would you help us with > these simple rpy commands? > > I did the following: > > python > > from rpy import r > > x = r.matrix(r.rnorm(100), 50, 2) > > r.kmeans(x, 2) > > The error was: > > Traceback (most recent call last): > File "<stdin>", line 1, in ? > rpy.RException: Error in as.double.default(x) : (list) object > cannot be > coerced to 'double' > > I also tried: > > x = numpy.array(x) before r.kmeans but it didn't work. > > I was able to run the same thing in R by doing: > > x = matrix(rnorm(100), 50, 2) > kmeans(x, 2) > > But the test with rpy failed miserably ... Any idea to help out? > > Thanks, > -Ding. > > ---------------------------------------------------------------------- > --- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2008. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > rpy-list mailing list > rpy-list@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/rpy-list ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ rpy-list mailing list rpy-list@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/rpy-list
