[MATRIX-SIG] Extending NumPy

Hoon Yoon - IPT Quant hyoon@nyptsrv1.etsd.ml.com
Tue, 19 Aug 1997 09:28:19 -0400


   I am finally embarking on extending Python with C programs and at
   this point I am trying to push in Lists of strings and get back 
   lists of strings and Numerical arrays back from a C function. 
   Unfortunately, I am having problems finding examples of these
   codes in C.  I guess the following from gdmodule does show how
   to kinda pass in a list or tuple into a C prog, but I am lost on
   how to do this for string arrays (multiple) and get back string 
   arrays and most of all Numeric Arrays:
Nice example of how to do this with number tuple
Can I use **points to do this for string tuple and args1, args2, args3?
   static PyObject *image_lines(self, args)
    imageobject *self;
    PyObject *args;
    PyObject *point, *points, *bit;
    int color, i, x,y,ox,oy;
    if (!PyArg_ParseTuple(args, "O!i", &PyTuple_Type, &points, &color))
        if (PyArg_ParseTuple(args, "O!i", &PyList_Type, &points, &color))
            points = PyList_AsTuple(points);
        else return NULL;
    point = PyTuple_GET_ITEM(points,0);
    ox = PyInt_AS_LONG((PyIntObject *)PyTuple_GET_ITEM(point,0));
    oy = PyInt_AS_LONG((PyIntObject *)PyTuple_GET_ITEM(point,1));
    for (i=1; i<PyTuple_Size(points); i++)
        point = PyTuple_GET_ITEM(points,i);
        x = PyInt_AS_LONG((PyIntObject *)PyTuple_GET_ITEM(point,0));
        y = PyInt_AS_LONG((PyIntObject *)PyTuple_GET_ITEM(point,1));
        gdImageLine(self->imagedata, X(ox), Y(oy), X(x), Y(y), color);
    return Py_None;
   Can anyone show me some example of these extentions, I've mentioned
   here? At least I would like to get back list in list 
   [[1,2,3],[4,5,6]] type of thing, which I could easily convert back
   to a Num Array.
Much appreciated,


MATRIX-SIG  - SIG on Matrix Math for Python

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