Merge pull request #17 from awishnick/master

Added astype to ndarray

boost/numpy/ndarray.hpp

@@ -79,6 +79,9 @@ public:
 
   /// @brief Return a view of the scalar with the given dtype.
   ndarray view(dtype const & dt) const;
+    
+  /// @brief Copy the array, cast to a specified type.
+  ndarray astype(dtype const & dt) const;
 
   /// @brief Copy the scalar (deep for all non-object fields).
   ndarray copy() const;

libs/numpy/doc/reference/ndarray.rst

@@ -37,6 +37,7 @@ synopsis
     };
 
     ndarray view(dtype const & dt) const;
+    ndarray astype(dtype const & dt) const;
     ndarray copy() const;
     int const shape(int n) const;
     int const strides(int n) const;
@@ -92,6 +93,12 @@ constructors
 
 :Returns: new ndarray with old ndarray data cast as supplied dtype
 
+::
+
+  ndarray astype(dtype const & dt) const;
+
+:Returns: new ndarray with old ndarray data converted to supplied dtype
+
 ::
 
   ndarray copy() const;

libs/numpy/src/ndarray.cpp

@@ -146,6 +146,12 @@ ndarray ndarray::view(dtype const & dt) const
   return ndarray(python::detail::new_reference
     (PyObject_CallMethod(this->ptr(), const_cast<char*>("view"), const_cast<char*>("O"), dt.ptr())));
 }
+    
+ndarray ndarray::astype(dtype const & dt) const
+{
+  return ndarray(python::detail::new_reference
+    (PyObject_CallMethod(this->ptr(), const_cast<char*>("astype"), const_cast<char*>("O"), dt.ptr())));
+}
 
 ndarray ndarray::copy() const 
 {