From 657013c9743d9774d2fbb227b16e575b2f1ac2b0 Mon Sep 17 00:00:00 2001
From: Jitse Niesen <jitse@maths.leeds.ac.uk>
Date: Mon, 27 Dec 2010 16:35:25 +0000
Subject: Mention ptr_fun in docs for .unaryExpr()

---
 doc/examples/class_CwiseUnaryOp_ptrfun.cpp | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 doc/examples/class_CwiseUnaryOp_ptrfun.cpp

(limited to 'doc/examples/class_CwiseUnaryOp_ptrfun.cpp')

diff --git a/doc/examples/class_CwiseUnaryOp_ptrfun.cpp b/doc/examples/class_CwiseUnaryOp_ptrfun.cpp
new file mode 100644
index 000000000..36706d8ed
--- /dev/null
+++ b/doc/examples/class_CwiseUnaryOp_ptrfun.cpp
@@ -0,0 +1,20 @@
+#include <Eigen/Core>
+#include <iostream>
+using namespace Eigen;
+using namespace std;
+
+// define function to be applied coefficient-wise
+double ramp(double x)
+{
+  if (x > 0)
+    return x;
+  else 
+    return 0;
+}
+
+int main(int, char**)
+{
+  Matrix4d m1 = Matrix4d::Random();
+  cout << m1 << endl << "becomes: " << endl << m1.unaryExpr(ptr_fun(ramp)) << endl;
+  return 0;
+}
-- 
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