Ishwor wrote:
> Tom
> Hi.
>> i want to use R with Python and Cairo. I have the following problem:
>>
>> ####################
>> # Python
>> ####################
>>>>> from rpy2 import robjects
>>>>> robjects.r('library(Cairo)')
>> Error in library(Cairo) : es gibt kein Paket 'Cairo'
>> Traceback (most recent call last):
>> File "<stdin>", line 1, in <module>
>> File "/usr/lib/python2.6/dist-packages/rpy2/robjects/__init__.py",
>> line 535, in __call__
>> res = self.eval(p)
>> File "/usr/lib/python2.6/dist-packages/rpy2/robjects/__init__.py",
>> line 422, in __call__
>> res = super(RFunction, self).__call__(*new_args, **new_kwargs)
>> rinterface.RRuntimeError: Error in library(Cairo) : es gibt kein Paket
>> 'Cairo'
>>
>> ####################
>> # R
>> ####################
>>> library(Cairo)
>>>
>>
>>
>> Can anybody help with this problem? My future plan is to use Python+R
>> +Django to produce nice graphs with R and display the graphs within a
>> website.
I think that the issue is the one reported by the RRuntimeError
exception (albeit in German): there is no such package known to the R
install used with rpy2. Error message can sometimes be informative.
http://rpy.sourceforge.net/rpy2/doc-dev/html/robjects.html#installing-removing-r-packages
> A question:
> Why are you loading Cairo from within R (Obviously assuming R has
> interface to Cairo ;-)
R has a package called Cairo.
http://cran.r-project.org/web/packages/Cairo/index.html
> http://cairographics.org/pycairo/ is python binding to Cairo graphics
> from _within_ Python (I'd use that if I had a choice)
>
> I'd would try n use Rpy2/Rpy only for R-related functions/algorithms
> and try to separate them. Once the calculations are done by
> Rpy/Rpy2/R, then use PyCairo to display the results _in_ Python.
R has much to offer for making graphics.
The following plot is made with two lines of Python code with rpy2:
http://rpy.sourceforge.net/rpy2/doc-dev/html/_images/graphics_ggplot2_smoothbycylwithcolours.png
I am not certain that using pycairo can give similar results without
writing much more code.
> Regarding Django interfacing another way is to use Protovis
> (http://vis.stanford.edu/protovis) to display the calculations from
> Rpy2 (at the presentation/HTML layer) using Django templates.
This is looking like a very interesting project... thanks for sharing
the link.
L.
> HTH.
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