The normal way to make the call to an r function using rpy is to call
it like so:
import rpy
rpy.r.function_name(a=1, b=2, c=4)
note that in R, the period character '.' is a valid part of names,
while in python it is not. To overcome this problem, rpy translates
the underscore character '_' to a period '.'. Thus to call the
function named 'pwr.p.test' you would use the python syntax:
import rpy
rpy.r.library("pwr")
rpy.r.pwr_p_test(h=0.2,power=0.95,sig.level=0.05)
-Greg
On Jun 17, 2007, at 1:21PM , <[EMAIL PROTECTED]>
<[EMAIL PROTECTED]> wrote:
I am a new user of RPy, just having completed a build of it on
Debian Etch using 1.0-RC1 and R-2.51. All seems to be running fine
on the R side and the RPY side, but I am struggling a bit with
syntax for parameters passing, and I am not able to find a question
on the mailing list to assist.
Quick version: I run the following (after loading the ‘pwr’
module) directly from R, and it works in R:
> pwr.p.test(h=0.2,power=0.95,sig.level=0.05)
With the following nice output:
…power calculation for binomial distribution (arcsine transformation)
h = 0.2
n = 324.8677
sig.level = 0.05
power = 0.95
alternative = two.sided
Using RPy, I am able to load the library OK
>>> r.library('pwr')
['pwr', 'stats', 'graphics', 'grDevices', 'utils', 'datasets',
'methods', 'base']
And I am able to create Robjs using that library:
>>> r['pwr.p.test']
<Robj object at 0xb7e141d0>
But I can’t sort out the right want to pass arguments to the object
(i.e., h=0.2,power=0.95,sig.level=0.05). I have tried various
dictionary and list forms, but no luck so far, just many errors. I
am suspecting it is about position dependency in the call, but I am
struggling with how to compensate for this.
Any suggestions from those in the know?
Much thanks,
- Michael
(for what’s its worth, python 2.4.4, Debian Etch, RPy 1.0-RC1 on
x86 seems to work, which was a question I had, when build from Etch
sources, but not using Etch binaries. I am not thinking this is
rekatred to my problem, as other examples run OK).
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