Revision: 723
http://rpy.svn.sourceforge.net/rpy/?rev=723&view=rev
Author: lgautier
Date: 2008-12-19 21:39:45 +0000 (Fri, 19 Dec 2008)
Log Message:
-----------
Edits to specify a little more what is happening with function calls
Modified Paths:
--------------
rpy2/branches/version_2.0.x/doc/source/rinterface.rst
rpy2/branches/version_2.0.x/doc/source/robjects.rst
Modified: rpy2/branches/version_2.0.x/doc/source/rinterface.rst
===================================================================
--- rpy2/branches/version_2.0.x/doc/source/rinterface.rst 2008-12-19
20:58:12 UTC (rev 722)
+++ rpy2/branches/version_2.0.x/doc/source/rinterface.rst 2008-12-19
21:39:45 UTC (rev 723)
@@ -604,10 +604,26 @@
>>> s = sum(x)
>>> s[0]
6
->>>
+.. rubric:: Named arguments
-.. index::
+Named arguments to an R function can be specified just the way
+they would be with any other regular Python function.
+
+>>> rnorm = rinterface.globalEnv.get("rnorm")
+>>> rnorm(rinterface.SexpVector([1, ], rinterface.INTSXP),
+ mean = rinterface.SexpVector([2, ], rinterface.INTSXP))[0]
+0.32796768001636134
+
+There are however frequent names for R parameters causing problems: all the
names with a *dot*. using such parameters for an R function will either require
+to:
+
+* use the special syntax `**kwargs` on a dictionary with the named parameters
+
+* use the method :meth:`rcall`.
+
+
+.. Index::
single: rcall; order of parameters
.. rubric:: Order for named parameters
@@ -623,15 +639,17 @@
import rpy2.rlike.container as rpc
args = rpc.ArgsDict()
- args['x'] = rinterface.SexpVector([1,2,3], rinterface.INTSXP)
- args[None] = rinterface.SexpVector([4,5], rinterface.INTSXP)
- args['y'] = rinterface.SexpVector([6, ], rinterface.INTSXP)
+ args['x'] = rinterface.IntSexpVector([1,2,3], rinterface.INTSXP)
+ args[None] = rinterface.IntSexpVector([4,5], rinterface.INTSXP)
+ args['y'] = rinterface.IntSexpVector([6, ], rinterface.INTSXP)
rlist = rinterface.baseNameSpaceEnv['list']
rl = rlist.rcall(args.items())
>>> [x for x in rl.do_slot("names")]
['x', '', 'y']
+
+
.. index::
single: closureEnv
Modified: rpy2/branches/version_2.0.x/doc/source/robjects.rst
===================================================================
--- rpy2/branches/version_2.0.x/doc/source/robjects.rst 2008-12-19 20:58:12 UTC
(rev 722)
+++ rpy2/branches/version_2.0.x/doc/source/robjects.rst 2008-12-19 21:39:45 UTC
(rev 723)
@@ -461,18 +461,29 @@
>>> rnorm = robjects.r.rnorm
>>> plot(rnorm(100), ylab="random")
-In Python, arguments to a function are split into two groups:
+This is all looking fine and simple until R parameters with names
+such as `na.rm` are encountered. In those cases, using the special
+syntax `**kwargs` is one way to go.
-* A first group for which parameters are in defined order
+Let's take an example in R:
-* A second group for which parameters are associated a name/keyword,
- and a default value. In that second group the order is lost, as it is
- passed as a Python dictionary.
+.. code-block:: r
-Those two groups can be used in function calls.
+ sum(0, na.rm = TRUE)
+In Python it can then write:
-The class inherits from the class
+.. code-block:: python
+
+ from rpy2 import robjects
+
+ myparams = {'na.rm': True}
+ robjects.r.sum(0, **myparams)
+
+Things are also not always that simple, as the use of dictionary does
+ensure that the order in which the parameters are passed is conserved.
+
+The R functions as defined in :mod:`rpy2.robjects` inherit from the class
:class:`rpy2.rinterface.SexpClosure`, and further documentation
on the behavior of function can be found in Section
:ref:`rinterface-functions`.
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