I know that this thing has been answered a lot of times and I have also read the documentation as well but still I am not able to clearly understand how is this working. As in, I am not able to understand how the values are populated in its arguments. The examples are not very clearly explaining it(or may be I am not able to). Can anyone please help me understand how are the arguments of this function populated? What should be their values? I have to pass a vector from C++ to Python without reallocating the memory. Any help is much appreciated. I am stuck on this from a lot of days.
My code which I am implementing:
The function is:
PyObject * PyArray_SimpleNewFromData( int nd, npy_intp* dims, int typenum, void* data)
The last argument (data) is a buffer to the data. Let's dispense with that.
The second argument (dims) is a buffer, whose each entry is a dimension; so for a 1d array, it could be a length-1 buffer (or even an integer, since each integer is a length-1 buffer)
Since the second argument is a buffer, the first argument (nd) tells its length
The third argument (typenum) indicates the type.
For example, say you have 4 64-bit ints at x:
To create an array, use
int dims[1]; dims[0] = 4; PyArray_SimpleNewFromData(1, dims, NPY_INT64, x)
To create a 2X2 matrix, use
int dims[2]; dims[0] = dims[1] = 2; PyArray_SimpleNewFromData(2, dims, NPY_INT64, x)
