Revision: 790
http://rpy.svn.sourceforge.net/rpy/?rev=790&view=rev
Author: lgautier
Date: 2010-11-01 06:42:28 +0000 (Mon, 01 Nov 2010)
Log Message:
-----------
news entries + edited layout for the website
Modified Paths:
--------------
trunk/htdocs/news.data
trunk/htdocs/templates/base.html
trunk/htdocs/templates/rpy_documentation.html
trunk/htdocs/templates/rpy_download.html
Modified: trunk/htdocs/news.data
===================================================================
--- trunk/htdocs/news.data 2010-10-17 18:25:48 UTC (rev 789)
+++ trunk/htdocs/news.data 2010-11-01 06:42:28 UTC (rev 790)
@@ -1,4 +1,99 @@
<!-- title: News -->
+title: Calling Python functions from R
+date: 2010-10-31
+
+<p>
+Among the new features in the upcoming version 2.2.0, there is
+the possibility to write in Python the functions to be passed to higher-order
+R functions. In other words, it is becoming possible to write a Python
+function and expose it to R in such a way that the embedded R engine
+can call it.
+</p>
+
+<p>
+As an example, let's consider the R function
+<i>optim()</i> that looks for optimal parameters for a given cost function.
+The cost function should be passed in the call to <i>optim()</i> as it will be
+repeatedly called as the parameter space is explored, and it is now possible
+to write that cost function in Python, as the code below demonstrates it.
+</p>
+
+<pre>
+from rpy2.robjects.vectors import FloatVector
+from rpy2.robjects.packages import importr
+import rpy2.rinterface as ri
+stats = importr('stats')
+
+# Rosenbrock Banana function as a cost function
+# (as in the R man page for optim())
+def cost_f(x):
+ x1 = x[0]
+ x2 = x[1]
+ return 100 * (x2 - x1 * x1)**2 + (1 - x1)**2
+
+# wrap the function f so it can be exposed to R
+cost_fr = ri.rternalize(cost_f)
+
+# starting parameters
+start_params = FloatVector((-1.2, 1))
+
+# call R's optim()
+res = stats.optim(start_params, cost_fr)
+</pre>
+
+<p>
+The example is working verbatim with today's snapshot of the code repository
+(branch version_2.2.x), although few modifications might be needed in the
+future. Although this is development code and version 2.2.0 is scheduled
+to be released some time next year, the
+<a
href="http://rpy.sourceforge.net/rpy2/doc-2.2/html/rinterface.html#calling-python-functions-from-r";>documentation
already outlines this feature</a>.
+Early testing is welcome, and issues can be reported on the
+<a href="http://bitbucket.org/lgautier/rpy2/issues/";>bitbucket tracker</a>.
+</p>
+
+<!-- title: News -->
+title: Release 2.1.7
+date: 2010-10-18
+
+<p>
+After a very short-lived release 2.1.6,
+a new bugfix release for the 2.1.x series is out.
+It should definitely fix the build/install issues when libraries
+are in least expected locations.
+</p>
+
+
+<!-- title: News -->
+title: R <i>external pointer</i>
+date: 2010-10-03
+
+<p>
+In R handling data structures in a foreign language (read C/C++)
+is done through an <i>external pointer</i>. Those
+pointer do not obey the pass-by-value rule and are
+not copied.
+</p>
+
+<p>
+The version 2.2.x has a new class <i>rpy2.rinterface.SexpExtPtr</i>
+to represent those objects. With this, handling from Python such C-level
constructs
+understood by some R packages, using for example <i>ctypes</i>,
+becomes possible. Further use of this for calling
+back Python functions from R within the rpy2 system will be tried in the
future.
+</p>
+
+<!-- title: News -->
+title: Release 2.1.5
+date: 2010-09-27
+
+<p>
+Bugfix release for the 2.1.x series. It only fixes (some of) the
+issues when building/installing while R libraries are in lesser
+expected places.
+</p>
+
+
+<!-- title: News -->
title: Reflection on R S4 classes
date: 2010-09-12
@@ -12,6 +107,7 @@
R can be exposed as a corresponding Python class, with that Python class
defined on the fly from the R class definition.
Although this is still under development, there is already <a
href="http://rpy.sourceforge.net/rpy2/doc-2.2/html/robjects_oop.html#automated-r-in-python-class-definitions";>documentation
for how to use it.</a>
+</p>
<!-- title: News -->
title: rpy2 and Python3
Modified: trunk/htdocs/templates/base.html
===================================================================
--- trunk/htdocs/templates/base.html 2010-10-17 18:25:48 UTC (rev 789)
+++ trunk/htdocs/templates/base.html 2010-11-01 06:42:28 UTC (rev 790)
@@ -48,13 +48,9 @@
<ul class="menu">
<li><a href="rpy.html">About</a></li>
<li><a href="rpy_bugs.html">Bugs</a></li>
- <li><a href="rpy_svn.html">Code repository</a></li>
- <li><a href="rpy_download.html">Download</a></li>
<li><a href="rpy_documentation.html">Documentation</a></li>
- <li><a href="rpy_demo.html">Demo</a></li>
- <li><a href="rpy_faq.html">FAQ</a></li>
- <li><a href="rpy_todo.html">To do</a></li>
- <li><a href="http://rpy.wiki.sourceforge.net/";>Wiki</a></li>
+ <li><a href="rpy_download.html">Download</a></li>
+ <!-- <li><a href="http://rpy.wiki.sourceforge.net/";>Wiki</a></li> -->
</ul>
<b>rpy2</b>
<ul class="menu">
Modified: trunk/htdocs/templates/rpy_documentation.html
===================================================================
--- trunk/htdocs/templates/rpy_documentation.html 2010-10-17 18:25:48 UTC
(rev 789)
+++ trunk/htdocs/templates/rpy_documentation.html 2010-11-01 06:42:28 UTC
(rev 790)
@@ -17,11 +17,12 @@
<li> <a href="rpy/doc/rpy_html.tgz">html</a> </li>
</ul>
</li>
+
+ <li><a href="rpy_faq.html">Frequently Asked Questions (FAQ)</a>.</li>
- <li><a href="faq.html">Frequently Asked Questions (FAQ)</a>.</li>
-
<li><a href="rpy/README">Rpy README</a> file</li>
+ <li><a href="rpy_todo.html">TO DO list</a></li>
<li>Demos
<ul>
<li>
Modified: trunk/htdocs/templates/rpy_download.html
===================================================================
--- trunk/htdocs/templates/rpy_download.html 2010-10-17 18:25:48 UTC (rev
789)
+++ trunk/htdocs/templates/rpy_download.html 2010-11-01 06:42:28 UTC (rev
790)
@@ -8,7 +8,12 @@
RPy Sourceforge downloads page
</a>.
</p>
+
<p>
+ Check the <a href="rpy_svn.html">SVN code repository</a> for a development
snapshot.
+ </p>
+
+ <p>
For <i>rpy2</i>, check the <a href="rpy2.html">rpy2 page</a>
</p>
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