Various improvements to the docs for unsupported.

* Enable compilation of examples for unsupported.
* Fix use of std::vector in BVH example.
* Add an example for the matrix exponential.
* Bug fixes in unsupported/doc/{examples,snippets}/CMakeLists.txt .

unsupported/doc/examples/BVH_Example.cpp

@@ -1,3 +1,4 @@
+#include <Eigen/StdVector>
 #include <unsupported/Eigen/BVH>
 
 using namespace Eigen;
@@ -20,7 +21,8 @@ struct PointPointMinimizer //how to compute squared distances between points and
 
 int main()
 {
-  std::vector<Vector2d> redPoints, bluePoints;
+  typedef std::vector<Vector2d, aligned_allocator<Vector2d> > StdVectorOfVector2d;
+  StdVectorOfVector2d redPoints, bluePoints;
   for(int i = 0; i < 100; ++i) { //initialize random set of red points and blue points
     redPoints.push_back(Vector2d::Random());
     bluePoints.push_back(Vector2d::Random());

unsupported/doc/examples/CMakeLists.txt

@@ -6,7 +6,7 @@ FOREACH(example_src ${examples_SRCS})
 GET_FILENAME_COMPONENT(example ${example_src} NAME_WE)
 ADD_EXECUTABLE(example_${example} ${example_src})
 GET_TARGET_PROPERTY(example_executable
-                    ${example} LOCATION)
+                    example_${example} LOCATION)
 ADD_CUSTOM_COMMAND(
   TARGET example_${example}
   POST_BUILD

unsupported/doc/examples/MatrixExponential.cpp

@@ -0,0 +1,18 @@
+#include <unsupported/Eigen/MatrixFunctions>
+
+using namespace Eigen;
+
+int main()
+{
+  const double pi = std::acos(-1);
+
+  MatrixXd A(3,3);
+  A << 0,    -pi/4, 0,
+       pi/4, 0,     0,
+       0,    0,     0;
+  std::cout << "The matrix A is:\n" << A << "\n\n";
+
+  MatrixXd B;
+  ei_matrix_exponential(A, &B);
+  std::cout << "The matrix exponential of A is:\n" << B << "\n\n";
+}