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Added working custom dtype exampel

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Ankit Daftery
2011-08-06 21:12:42 +00:00
parent 437373456f
commit c314274a56
1 changed files with 21 additions and 0 deletions
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libs/numpy/doc/dtype.rst
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@@ -31,4 +31,25 @@ Here, we first convert the variable into a string, and then extract it as a C++
We can also print the dtypes of the data members of the ndarray by using the get_dtype method for the ndarray ::
std::cout << "Datatype is:\n" << p::extract<char const *>(p::str(a.get_dtype())) << std::endl ;
We can also create custom dtypes and build ndarrays with the custom dtypes
We use the dtype constructor to create a custom dtype. This constructor takes a list as an argument.
The list should contain one or more tuples of the format (variable name, variable type)
So first create a tuple with a variable name and its dtype, double, to create a custom dtype ::
p::tuple for_custom_dtype = p::make_tuple("ha",dtype) ;
Next, create a list, and add this tuple to the list. Then use the list to create the custom dtype ::
p::list list_for_dtype ;
list_for_dtype.append(for_custom_dtype) ;
np::dtype custom_dtype = np::dtype(list_for_dtype) ;
We are now ready to create an ndarray with dimensions specified by \*shape\* and of custom dtpye ::
np::ndarray new_array = np::zeros(shape,custom_dtype);
}