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#include "Python.h"
#include "structmember.h"
#include "scipy/arrayobject.h"
static PyObject *ErrorObject;
#define Py_Try(BOOLEAN) {if (!(BOOLEAN)) goto fail;}
#define Py_Assert(BOOLEAN,MESS) {if (!(BOOLEAN)) { \
PyErr_SetString(ErrorObject, (MESS)); \
goto fail;} \
}
static intp
incr_slot_ (double x, double *bins, intp lbins)
{
intp i ;
for ( i = 0 ; i < lbins ; i ++ )
if ( x < bins [i] )
return i ;
return lbins ;
}
static intp
decr_slot_ (double x, double * bins, intp lbins)
{
intp i ;
for ( i = lbins - 1 ; i >= 0; i -- )
if (x < bins [i])
return i + 1 ;
return 0 ;
}
static int
monotonic_ (double * a, int lena)
{
int i;
if (a [0] <= a [1]) /* possibly monotonic increasing */
{
for (i = 1 ; i < lena - 1; i ++)
if (a [i] > a [i + 1]) return 0 ;
return 1 ;
}
else /* possibly monotonic decreasing */
{
for (i = 1 ; i < lena - 1; i ++)
if (a [i] < a [i + 1]) return 0 ;
return -1 ;
}
}
static intp
mxx (intp *i , intp len)
{
/* find the index of the maximum element of an integer array */
intp mx = 0, max = i[0] ;
intp j ;
for ( j = 1 ; j < len; j ++ )
if ( i [j] > max )
{max = i [j] ;
mx = j ;}
return mx;
}
static intp
mnx (intp *i , intp len)
{
/* find the index of the minimum element of an integer array */
intp mn = 0, min = i [0] ;
intp j ;
for ( j = 1 ; j < len; j ++ )
if ( i [j] < min )
{min = i [j] ;
mn = j ;}
return mn;
}
static PyObject *
arr_bincount(PyObject *self, PyObject *args, PyObject *kwds)
{
/* histogram accepts one or two arguments. The first is an array
* of non-negative integers and the second, if present, is an
* array of weights, which must be promotable to double.
* Call these arguments list and weight. Both must be one-
* dimensional. len (weight) == len(list)
* If weight is not present:
* histogram (list) [i] is the number of occurrences of i in list.
* If weight is present:
* histogram (list, weight) [i] is the sum of all weight [j]
* where list [j] == i. */
/* self is not used */
PyArray_Descr *type;
PyObject *list = NULL, *weight=Py_None ;
PyObject *lst=NULL, *ans=NULL, *wts=NULL;
intp *numbers, *ians, len , mxi, mni, ans_size;
int i;
double *weights , *dans;
static char *kwlist[] = {"list", "weights", NULL};
Py_Try(PyArg_ParseTupleAndKeywords(args, kwds, "O|O", kwlist,
&list, &weight));
Py_Try(lst = PyArray_ContiguousFromAny(list, PyArray_INTP, 1, 1));
len = PyArray_SIZE(lst);
numbers = (intp *) PyArray_DATA(lst);
mxi = mxx (numbers, len) ;
mni = mnx (numbers, len) ;
Py_Assert(numbers[mni] >= 0,
"irst argument of bincount must be non-negative");
ans_size = numbers [mxi] + 1 ;
type = PyArray_DescrFromType(PyArray_INTP);
if (weight == Py_None) {
Py_Try(ans = PyArray_Zeros(1, &ans_size, type, 0));
ians = (intp *)(PyArray_DATA(ans));
for (i = 0 ; i < len ; i++)
ians [numbers [i]] += 1 ;
Py_DECREF(lst);
}
else {
Py_Try(wts = PyArray_ContiguousFromAny(weight,
PyArray_DOUBLE, 1, 1));
weights = (double *)PyArray_DATA (wts);
Py_Assert(PyArray_SIZE(wts) == len, "bincount: length of weights " \
"does not match that of list");
type = PyArray_DescrFromType(PyArray_DOUBLE);
Py_Try(ans = PyArray_Zeros(1, &ans_size, type, 0));
dans = (double *)PyArray_DATA (ans);
for (i = 0 ; i < len ; i++) {
dans[numbers[i]] += weights[i];
}
Py_DECREF(lst);
Py_DECREF(wts);
}
return ans;
fail:
Py_XDECREF(lst);
Py_XDECREF(wts);
Py_XDECREF(ans);
return NULL;
}
static PyObject *
arr_digitize(PyObject *self, PyObject *args, PyObject *kwds)
{
/* digitize (x, bins) returns an array of python integers the same
length of x. The values i returned are such that
bins [i - 1] <= x < bins [i] if bins is monotonically increasing,
or bins [i - 1] > x >= bins [i] if bins is monotonically decreasing.
Beyond the bounds of bins, returns either i = 0 or i = len (bins)
as appropriate. */
/* self is not used */
PyObject *ox, *obins ;
PyObject *ax=NULL, *abins=NULL, *aret=NULL;
double *dx, *dbins ;
intp lbins, lx ; /* lengths */
intp *iret;
int m, i ;
static char *kwlist[] = {"x", "bins", NULL};
PyArray_Descr *type;
Py_Try(PyArg_ParseTupleAndKeywords(args, kwds, "OO", kwlist,
&ox, &obins));
type = PyArray_DescrFromType(PyArray_DOUBLE);
Py_Try(ax=PyArray_FromAny(ox, type, 1, 1, CARRAY_FLAGS));
Py_Try(abins = PyArray_FromAny(obins, type, 1, 1, CARRAY_FLAGS));
lx = PyArray_SIZE(ax);
dx = (double *)PyArray_DATA(ax);
lbins = PyArray_SIZE(abins);
dbins = (double *)PyArray_DATA(abins);
Py_Try(aret = PyArray_SimpleNew(1, &lx, PyArray_INTP));
iret = (intp *)PyArray_DATA(aret);
Py_Assert(lx > 0 && lbins > 0,
"x and bins both must have non-zero length");
if (lbins == 1) {
for (i=0 ; i<lx ; i++)
if (dx [i] >= dbins[0])
iret[i] = 1;
else
iret[i] = 0;
}
else {
m = monotonic_ (dbins, lbins) ;
if ( m == -1 ) {
for ( i = 0 ; i < lx ; i ++ )
iret [i] = decr_slot_ (dx [i], dbins, lbins) ;
}
else if ( m == 1 ) {
for ( i = 0 ; i < lx ; i ++ )
iret [i] = incr_slot_ ((float)dx [i], dbins, lbins) ;
}
else Py_Assert(0, "bins must be montonically increasing or decreasing");
}
Py_DECREF(ax);
Py_DECREF(abins);
return aret;
fail:
Py_XDECREF(ax);
Py_XDECREF(abins);
Py_XDECREF(aret);
return NULL;
}
static char arr_insert__doc__[] = "Insert vals sequentially into equivalent 1-d positions indicated by mask.";
static PyObject *
arr_insert(PyObject *self, PyObject *args, PyObject *kwdict)
{
/* Returns input array with values inserted sequentially into places
indicated by the mask
*/
PyObject *mask=NULL, *vals=NULL;
PyArrayObject *ainput=NULL, *amask=NULL, *avals=NULL,
*tmp=NULL;
int numvals, totmask, sameshape;
char *input_data, *mptr, *vptr, *zero=NULL;
int melsize, delsize, copied, nd;
intp *instrides, *inshape;
int mindx, rem_indx, indx, i, k, objarray;
static char *kwlist[] = {"input","mask","vals",NULL};
if (!PyArg_ParseTupleAndKeywords(args, kwdict, "O&OO", kwlist,
PyArray_Converter, &ainput,
&mask, &vals))
goto fail;
amask = (PyArrayObject *) PyArray_FROM_OF(mask, CARRAY_FLAGS);
if (amask == NULL) goto fail;
/* Cast an object array */
if (amask->descr->type_num == PyArray_OBJECT) {
tmp = (PyArrayObject *)PyArray_Cast(amask, PyArray_INTP);
if (tmp == NULL) goto fail;
Py_DECREF(amask);
amask = tmp;
}
sameshape = 1;
if (amask->nd == ainput->nd) {
for (k=0; k < amask->nd; k++)
if (amask->dimensions[k] != ainput->dimensions[k])
sameshape = 0;
}
else { /* Test to see if amask is 1d */
if (amask->nd != 1) sameshape = 0;
else if ((PyArray_SIZE(ainput)) != PyArray_SIZE(amask)) sameshape = 0;
}
if (!sameshape) {
PyErr_SetString(PyExc_TypeError,
"mask array must be 1-d or same shape as input array");
goto fail;
}
avals = (PyArrayObject *)PyArray_FromObject(vals, ainput->descr->type_num, 0, 1);
if (avals == NULL) goto fail;
numvals = PyArray_SIZE(avals);
nd = ainput->nd;
input_data = ainput->data;
mptr = amask->data;
melsize = amask->descr->elsize;
vptr = avals->data;
delsize = avals->descr->elsize;
zero = PyArray_Zero(amask);
if (zero == NULL)
goto fail;
objarray = (ainput->descr->type_num == PyArray_OBJECT);
/* Handle zero-dimensional case separately */
if (nd == 0) {
if (memcmp(mptr,zero,melsize) != 0) {
/* Copy value element over to input array */
memcpy(input_data,vptr,delsize);
if (objarray) Py_INCREF(*((PyObject **)vptr));
}
Py_DECREF(amask);
Py_DECREF(avals);
PyDataMem_FREE(zero);
Py_INCREF(Py_None);
return Py_None;
}
/* Walk through mask array, when non-zero is encountered
copy next value in the vals array to the input array.
If we get through the value array, repeat it as necessary.
*/
totmask = (int) PyArray_SIZE(amask);
copied = 0;
instrides = ainput->strides;
inshape = ainput->dimensions;
for (mindx = 0; mindx < totmask; mindx++) {
if (memcmp(mptr,zero,melsize) != 0) {
/* compute indx into input array
*/
rem_indx = mindx;
indx = 0;
for(i=nd-1; i > 0; --i) {
indx += (rem_indx % inshape[i]) * instrides[i];
rem_indx /= inshape[i];
}
indx += rem_indx * instrides[0];
/* fprintf(stderr, "mindx = %d, indx=%d\n", mindx, indx); */
/* Copy value element over to input array */
memcpy(input_data+indx,vptr,delsize);
if (objarray) Py_INCREF(*((PyObject **)vptr));
vptr += delsize;
copied += 1;
/* If we move past value data. Reset */
if (copied >= numvals) vptr = avals->data;
}
mptr += melsize;
}
Py_DECREF(amask);
Py_DECREF(avals);
PyDataMem_FREE(zero);
Py_DECREF(ainput);
Py_INCREF(Py_None);
return Py_None;
fail:
PyDataMem_FREE(zero);
Py_XDECREF(ainput);
Py_XDECREF(amask);
Py_XDECREF(avals);
return NULL;
}
static PyTypeObject *PyMemberDescr_TypePtr=NULL;
static PyTypeObject *PyGetSetDescr_TypePtr=NULL;
/* Can only be called if doc is currently NULL
*/
static PyObject *
arr_add_docstring(PyObject *dummy, PyObject *args)
{
PyObject *obj;
PyObject *str;
char *docstr;
static char *msg = "already has a docstring";
if (!PyArg_ParseTuple(args, "OO!", &obj, &PyString_Type, &str))
return NULL;
docstr = PyString_AS_STRING(str);
#define _TESTDOC1(typebase) (obj->ob_type == &Py##typebase##_Type)
#define _TESTDOC2(typebase) (obj->ob_type == Py##typebase##_TypePtr)
#define _ADDDOC(typebase, doc, name) { \
Py##typebase##Object *new = (Py##typebase##Object *)obj; \
if (!(doc)) { \
doc = docstr; \
} \
else { \
PyErr_Format(PyExc_RuntimeError, \
"%s method %s",name, msg); \
return NULL; \
} \
}
if _TESTDOC1(CFunction)
_ADDDOC(CFunction, new->m_ml->ml_doc, new->m_ml->ml_name)
else if _TESTDOC1(Type)
_ADDDOC(Type, new->tp_doc, new->tp_name)
else if _TESTDOC2(MemberDescr)
_ADDDOC(MemberDescr, new->d_member->doc, new->d_member->name)
else if _TESTDOC2(GetSetDescr)
_ADDDOC(GetSetDescr, new->d_getset->doc, new->d_getset->name)
else {
PyErr_SetString(PyExc_TypeError,
"Cannot set a docstring for that object");
return NULL;
}
#undef _TESTDOC1
#undef _TESTDOC2
#undef _ADDDOC
Py_INCREF(str);
Py_INCREF(Py_None);
return Py_None;
}
static struct PyMethodDef methods[] = {
{"_insert", (PyCFunction)arr_insert, METH_VARARGS | METH_KEYWORDS,
arr_insert__doc__},
{"bincount", (PyCFunction)arr_bincount,
METH_VARARGS | METH_KEYWORDS, NULL},
{"digitize", (PyCFunction)arr_digitize, METH_VARARGS | METH_KEYWORDS,
NULL},
{"add_docstring", (PyCFunction)arr_add_docstring, METH_VARARGS,
NULL},
{NULL, NULL} /* sentinel */
};
static void
define_types(void)
{
PyObject *tp_dict;
PyObject *myobj;
tp_dict = PyArrayDescr_Type.tp_dict;
/* Get "subdescr" */
myobj = PyDict_GetItemString(tp_dict, "fields");
if (myobj == NULL) return;
PyGetSetDescr_TypePtr = myobj->ob_type;
myobj = PyDict_GetItemString(tp_dict, "alignment");
if (myobj == NULL) return;
PyMemberDescr_TypePtr = myobj->ob_type;
return;
}
/* Initialization function for the module (*must* be called initArray) */
DL_EXPORT(void) init_compiled_base(void) {
PyObject *m, *d, *s;
/* Create the module and add the functions */
m = Py_InitModule("scipy.base._compiled_base", methods);
/* Import the array and ufunc objects */
import_array();
/* Add some symbolic constants to the module */
d = PyModule_GetDict(m);
s = PyString_FromString("0.5");
PyDict_SetItemString(d, "__version__", s);
Py_DECREF(s);
ErrorObject = PyString_FromString("scipy.base._compiled_base.error");
PyDict_SetItemString(d, "error", ErrorObject);
Py_DECREF(ErrorObject);
/* define PyGetSetDescr_Type and PyMemberDescr_Type */
define_types();
/* Check for errors */
if (PyErr_Occurred())
Py_FatalError("can't initialize module _compiled_base");
}
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