diff --git a/include/boost/compute/algorithm/detail/radix_sort.hpp b/include/boost/compute/algorithm/detail/radix_sort.hpp
index 1ff3aee6c..3c31cee50 100644
--- a/include/boost/compute/algorithm/detail/radix_sort.hpp
+++ b/include/boost/compute/algorithm/detail/radix_sort.hpp
@@ -281,7 +281,7 @@ inline void radix_sort_impl(const buffer_iterator<T> first,
 
     // load radix sort program
     program radix_sort_program = cache->get_or_build(
-        cache_key, options.str(), radix_sort_source, context
+       cache_key, options.str(), boost::compute::type_definition<T2>() +"\n"+radix_sort_source, context
     );
 
     kernel count_kernel(radix_sort_program, "count");
diff --git a/include/boost/compute/algorithm/nth_element.hpp b/include/boost/compute/algorithm/nth_element.hpp
index 68f7a3dbc..94b631033 100644
--- a/include/boost/compute/algorithm/nth_element.hpp
+++ b/include/boost/compute/algorithm/nth_element.hpp
@@ -43,8 +43,7 @@ inline void nth_element(Iterator first,
             first, last, ::boost::compute::bind(compare, _1, value), queue
         );
 
-        Iterator old_nth = find(new_nth, last, value, queue);
-
+        Iterator old_nth = find_if(new_nth,last,nor1(boost::compute::bind(compare, _1, value),boost::compute::bind(compare, value, _1)),queue);
         value_type new_value = new_nth.read(queue);
 
         fill_n(new_nth, 1, value, queue);
diff --git a/include/boost/compute/detail/meta_kernel.hpp b/include/boost/compute/detail/meta_kernel.hpp
index 7be778b02..524c2f05c 100644
--- a/include/boost/compute/detail/meta_kernel.hpp
+++ b/include/boost/compute/detail/meta_kernel.hpp
@@ -968,6 +968,14 @@ inline meta_kernel& operator<<(meta_kernel &kernel,
     return kernel << "!(" << expr.pred()(expr.expr()) << ')';
 }
 
+template<class Predicate1,class Predicate2, class Arg>
+inline meta_kernel& operator<<(meta_kernel &kernel,
+                               const invoked_unary_nor_function<Predicate1,Predicate2,
+                               Arg> &expr)
+{
+    return kernel << "!((" << expr.pred1()(expr.expr1()) <<")||("<<expr.pred2()(expr.expr2())<< "))";
+}
+
 template<class Predicate, class Arg1, class Arg2>
 inline meta_kernel& operator<<(meta_kernel &kernel,
                                const invoked_binary_negate_function<Predicate,
diff --git a/include/boost/compute/functional/logical.hpp b/include/boost/compute/functional/logical.hpp
index 2e2c7518b..a58bce547 100644
--- a/include/boost/compute/functional/logical.hpp
+++ b/include/boost/compute/functional/logical.hpp
@@ -42,6 +42,47 @@ class invoked_unary_negate_function
     Predicate m_pred;
     Expr m_expr;
 };
+    
+template<class Predicate1,class Predicate2, class Expr>
+class invoked_unary_nor_function
+{
+public:
+    typedef int result_type;
+    
+    invoked_unary_nor_function(const Predicate1 &pred1,
+                               const Expr &expr1,
+                               const Predicate2 &pred2,
+                               const Expr &expr2)
+    : m_pred1(pred1),
+    m_expr1(expr1),
+    m_pred2(pred2),
+    m_expr2(expr2)
+    {
+    }
+    
+    Predicate1 pred1() const
+    {
+        return m_pred1;
+    }
+    
+    Expr expr1() const
+    {
+        return m_expr1;
+    }
+    Predicate2 pred2() const
+    {
+        return m_pred2;
+    }
+    
+    Expr expr2() const
+    {
+        return m_expr2;
+    }
+private:
+    Predicate1 m_pred1;
+    Predicate2 m_pred2;
+    Expr m_expr1,m_expr2;
+};
 
 template<class Predicate, class Expr1, class Expr2>
 class invoked_binary_negate_function
@@ -134,6 +175,34 @@ class unary_negate : public unary_function<void, int>
 private:
     Predicate m_pred;
 };
+    
+/// The unary_nor function adaptor nor 2 unary function.
+///
+/// \see nor1()
+template<class Predicate1,class Predicate2>
+class unary_nor : public unary_function<void, int>
+{
+public:
+    explicit unary_nor(Predicate1 pred1,Predicate2 pred2)
+    : m_pred1(pred1),m_pred2(pred2)
+    {
+    }
+    
+    /// \internal_
+    template<class Arg>
+    detail::invoked_unary_nor_function<Predicate1,Predicate2, Arg>
+    operator()(const Arg &arg) const
+    {
+        return detail::invoked_unary_nor_function<
+        Predicate1,Predicate2,
+        Arg
+        >(m_pred1, arg,m_pred2,arg);
+    }
+    
+private:
+    Predicate1 m_pred1;
+    Predicate2 m_pred2;
+};
 
 /// The binnary_negate function adaptor negates a binary function.
 ///
@@ -174,6 +243,18 @@ inline unary_negate<Predicate> not1(const Predicate &predicate)
     return unary_negate<Predicate>(predicate);
 }
 
+/// Returns a unary_nor adaptor around \p predicates.
+///
+/// \param predicate the unary function to wrap
+/// \param predicate the unary function to wrap
+///
+/// \return a unary_nor wrapper around \p predicates
+template<class Predicate1,class Predicate2>
+inline unary_nor<Predicate1,Predicate2> nor1(const Predicate1 &predicate1,const Predicate2 &predicate2)
+{
+    return unary_nor<Predicate1,Predicate2>(predicate1,predicate2);
+}
+
 /// Returns a binary_negate adaptor around \p predicate.
 ///
 /// \param predicate the binary function to wrap