Look at add c/c++ to numpy example

[xichaoqiang]

Numpy is very common used in python to array computation.Is there any way to convert emxarry in C or coder array in C++ by numpy.i offered by numpy?

[rlivings39]

https://numpy.org/doc/stable/reference/swig.html Could be interesting

[xichaoqiang]

https://numpy.org/doc/stable/reference/swig.html Could be interesting

Dear,sir Thanks for you reply.

I know swig in these few days.And I try to warp emxArray_real_T to numpy array.

Here I want get y= timestwo(x) in python,where x and y are numpy array.

The code shown as below is my code in timestwo.i file, it can't work.

Can you help me to fix it?

/* numpy array as input convert to emxArray_real_T */
%typemap(in)
    (emxArray_real_T*)
    (PyArrayObject* array=NULL, int is_new_object=0)
{
    array = (PyArrayObject*) obj_to_array_contiguous_allow_conversion($input, NPY_DOUBLE, &is_new_object);
    if (!array) SWIG_fail;
    int numDimensions;
	numDimensions=array_numdims(array)	;
	int*size= (int*)malloc(numDimensions * sizeof(int));
	int n_elems=1;
	for (int i=0;i<numDimensions;i++)
	{
	size[i]=array_size(array, i);
	n_elems*=size[i];	
	}
    $1 = emxCreateND_real_T(numDimensions, size);
    memcpy($1->data, array_data(array), n_elems);
}

/*emxArray_real_T out convert to numpyas */
%typemap(out) 
(emxArray_real_T*)
{
    $result = NULL;
    if ($1)
    {	
            int numDimensions= $1->numDimensions;
            npy_intp dims =  $1->size ;
            PyObject* res_array = PyArray_SimpleNewFromData(numDimensions, dims, NPY_DOUBLE,$1->data);
            $result = SWIG_Python_AppendOutput($result, res_array);
            emxDestroyArray_real_T($1);
    }

    if($result == NULL)
    {
        PyErr_SetString(PyExc_RuntimeError, "Result not yet implemented");
    }
}