added python bindings for derivative

python/spline_python.cpp

@@ -159,6 +159,8 @@ BOOST_PYTHON_MODULE(spline)
             .def("min", &bezier_t::min)
             .def("max", &bezier_t::max)
             .def("__call__", &bezier_t::operator())
+            .def("derivate", &bezier_t::derivate)
+            .def("compute_derivate", &bezier_t::compute_derivate)
         ;
     /** END bezier curve**/
 

python/test/test.py

@@ -11,6 +11,10 @@ a = bezier(waypoints, -1., 3.)
 a.min()
 a.max()
 a(0.4)
+assert((a.derivate(0.4,0) == a(0.4)).all())
+a.derivate(0.4,2)
+
+a = a.compute_derivate(100)
 
 
 #testing spline function