Hi Hao, The exact example that triggers the error may matter.
I just tried the following with rpy2-2.1dev and it worked. x = robjects.FloatVector((1,2,3)) y = robjects.FloatVector((2,3,4)) res = robjects.r['chisq.test'](x, y) I only get the following Warning message: In function (x, y = NULL, correct = TRUE, p = rep(1/length(x), length(x)), : Chi-squared approximation may be incorrect L. Hao Fan wrote: > Hi, list > > I would like to calculate the fitness of two histograms, so I tried > to use the chisq.test() in R through rpy2. > The python code I have is as follows: > ------------------- > import rpy2.robjects as robjects > > p1dist = [X1, X2, ... Xm] > p2dist = [Y1, Y2, ... Ym] > > rp1dist = robjects.FloatVector(p1dist) > rp2dist = robjects.FloatVector(p2dist) > > robjects.r['chisq.test'](rp1dist, rp2dist) > ------------------- > > Then I got the following error: > File "/usr/lib64/python2.6/site-packages/rpy2/robjects/__init__.py", in > __call__ > res = super(RFunction, self).__call__(*new_args, **new_kwargs) > rinterface.RRuntimeError: Error in names(dimnames(x)) <- DNAME : > 'names' attribute [62] must be the same length as the vector [2] > > > I also tried rpy_classic, so my code change to the follows: > -------------------- > import rpy2.robjects as robjects > import rpy2.rpy_classic as rpy > rpy.set_default_mode(rpy.NO_CONVERSION) > > p1dist = [X1, X2, ... Xm] > p2dist = [Y1, Y2, ... Ym] > > rp1dist = robjects.FloatVector(p1dist) > rp2dist = robjects.FloatVector(p2dist) > > robjects.r['chisq.test'](rp1dist, rp2dist) > ----------------- > > Then I got similar error: > File "/usr/lib64/python2.6/site-packages/rpy2/rpy_classic.py", line 214, > in __call__ > res = self.__sexp(*args_r, **kwargs_r) > rinterface.RRuntimeError: Error in names(dimnames(x)) <- DNAME : > 'names' attribute [62] must be the same length as the vector [2] > > > I feel this problem is due to my wrong use of the R vector, but I > can not find it. Any hints will be mostly appreciated! > Thanks a lot in advance! > > > Hao > > > > > > > > > > ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ rpy-list mailing list rpy-list@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/rpy-list
