home *** CD-ROM | disk | FTP | other *** search
-
- /* Complex object implementation */
-
- /* Borrows heavily from floatobject.c */
-
- /* Submitted by Jim Hugunin */
-
- #ifndef WITHOUT_COMPLEX
-
- #include "Python.h"
-
-
- /* elementary operations on complex numbers */
-
- static Py_complex c_1 = {1., 0.};
-
- Py_complex c_sum(Py_complex a, Py_complex b)
- {
- Py_complex r;
- r.real = a.real + b.real;
- r.imag = a.imag + b.imag;
- return r;
- }
-
- Py_complex c_diff(Py_complex a, Py_complex b)
- {
- Py_complex r;
- r.real = a.real - b.real;
- r.imag = a.imag - b.imag;
- return r;
- }
-
- Py_complex c_neg(Py_complex a)
- {
- Py_complex r;
- r.real = -a.real;
- r.imag = -a.imag;
- return r;
- }
-
- Py_complex c_prod(Py_complex a, Py_complex b)
- {
- Py_complex r;
- r.real = a.real*b.real - a.imag*b.imag;
- r.imag = a.real*b.imag + a.imag*b.real;
- return r;
- }
-
- Py_complex c_quot(Py_complex a, Py_complex b)
- {
- Py_complex r;
- double d = b.real*b.real + b.imag*b.imag;
- if (d == 0.)
- errno = EDOM;
- r.real = (a.real*b.real + a.imag*b.imag)/d;
- r.imag = (a.imag*b.real - a.real*b.imag)/d;
- return r;
- }
-
- Py_complex c_pow(Py_complex a, Py_complex b)
- {
- Py_complex r;
- double vabs,len,at,phase;
- if (b.real == 0. && b.imag == 0.) {
- r.real = 1.;
- r.imag = 0.;
- }
- else if (a.real == 0. && a.imag == 0.) {
- if (b.imag != 0. || b.real < 0.)
- errno = ERANGE;
- r.real = 0.;
- r.imag = 0.;
- }
- else {
- vabs = hypot(a.real,a.imag);
- len = pow(vabs,b.real);
- at = atan2(a.imag, a.real);
- phase = at*b.real;
- if (b.imag != 0.0) {
- len /= exp(at*b.imag);
- phase += b.imag*log(vabs);
- }
- r.real = len*cos(phase);
- r.imag = len*sin(phase);
- }
- return r;
- }
-
- static Py_complex c_powu(Py_complex x, long n)
- {
- Py_complex r, p;
- long mask = 1;
- r = c_1;
- p = x;
- while (mask > 0 && n >= mask) {
- if (n & mask)
- r = c_prod(r,p);
- mask <<= 1;
- p = c_prod(p,p);
- }
- return r;
- }
-
- static Py_complex c_powi(Py_complex x, long n)
- {
- Py_complex cn;
-
- if (n > 100 || n < -100) {
- cn.real = (double) n;
- cn.imag = 0.;
- return c_pow(x,cn);
- }
- else if (n > 0)
- return c_powu(x,n);
- else
- return c_quot(c_1,c_powu(x,-n));
-
- }
-
- PyObject *
- PyComplex_FromCComplex(Py_complex cval)
- {
- register PyComplexObject *op;
-
- /* PyObject_New is inlined */
- op = (PyComplexObject *) PyObject_MALLOC(sizeof(PyComplexObject));
- if (op == NULL)
- return PyErr_NoMemory();
- PyObject_INIT(op, &PyComplex_Type);
- op->cval = cval;
- return (PyObject *) op;
- }
-
- PyObject *
- PyComplex_FromDoubles(double real, double imag)
- {
- Py_complex c;
- c.real = real;
- c.imag = imag;
- return PyComplex_FromCComplex(c);
- }
-
- double
- PyComplex_RealAsDouble(PyObject *op)
- {
- if (PyComplex_Check(op)) {
- return ((PyComplexObject *)op)->cval.real;
- }
- else {
- return PyFloat_AsDouble(op);
- }
- }
-
- double
- PyComplex_ImagAsDouble(PyObject *op)
- {
- if (PyComplex_Check(op)) {
- return ((PyComplexObject *)op)->cval.imag;
- }
- else {
- return 0.0;
- }
- }
-
- Py_complex
- PyComplex_AsCComplex(PyObject *op)
- {
- Py_complex cv;
- if (PyComplex_Check(op)) {
- return ((PyComplexObject *)op)->cval;
- }
- else {
- cv.real = PyFloat_AsDouble(op);
- cv.imag = 0.;
- return cv;
- }
- }
-
- static void
- complex_dealloc(PyObject *op)
- {
- PyObject_DEL(op);
- }
-
-
- static void
- complex_buf_repr(char *buf, PyComplexObject *v)
- {
- if (v->cval.real == 0.)
- sprintf(buf, "%.12gj", v->cval.imag);
- else
- sprintf(buf, "(%.12g%+.12gj)", v->cval.real, v->cval.imag);
- }
-
- static int
- complex_print(PyComplexObject *v, FILE *fp, int flags)
- /* flags -- not used but required by interface */
- {
- char buf[100];
- complex_buf_repr(buf, v);
- fputs(buf, fp);
- return 0;
- }
-
- static PyObject *
- complex_repr(PyComplexObject *v)
- {
- char buf[100];
- complex_buf_repr(buf, v);
- return PyString_FromString(buf);
- }
-
- static int
- complex_compare(PyComplexObject *v, PyComplexObject *w)
- {
- /* Note: "greater" and "smaller" have no meaning for complex numbers,
- but Python requires that they be defined nevertheless. */
- Py_complex i, j;
- i = v->cval;
- j = w->cval;
- if (i.real == j.real && i.imag == j.imag)
- return 0;
- else if (i.real != j.real)
- return (i.real < j.real) ? -1 : 1;
- else
- return (i.imag < j.imag) ? -1 : 1;
- }
-
- static long
- complex_hash(PyComplexObject *v)
- {
- long hashreal, hashimag, combined;
- hashreal = _Py_HashDouble(v->cval.real);
- if (hashreal == -1)
- return -1;
- hashimag = _Py_HashDouble(v->cval.imag);
- if (hashimag == -1)
- return -1;
- /* Note: if the imaginary part is 0, hashimag is 0 now,
- * so the following returns hashreal unchanged. This is
- * important because numbers of different types that
- * compare equal must have the same hash value, so that
- * hash(x + 0*j) must equal hash(x).
- */
- combined = hashreal + 1000003 * hashimag;
- if (combined == -1)
- combined = -2;
- return combined;
- }
-
- static PyObject *
- complex_add(PyComplexObject *v, PyComplexObject *w)
- {
- Py_complex result;
- PyFPE_START_PROTECT("complex_add", return 0)
- result = c_sum(v->cval,w->cval);
- PyFPE_END_PROTECT(result)
- return PyComplex_FromCComplex(result);
- }
-
- static PyObject *
- complex_sub(PyComplexObject *v, PyComplexObject *w)
- {
- Py_complex result;
- PyFPE_START_PROTECT("complex_sub", return 0)
- result = c_diff(v->cval,w->cval);
- PyFPE_END_PROTECT(result)
- return PyComplex_FromCComplex(result);
- }
-
- static PyObject *
- complex_mul(PyComplexObject *v, PyComplexObject *w)
- {
- Py_complex result;
- PyFPE_START_PROTECT("complex_mul", return 0)
- result = c_prod(v->cval,w->cval);
- PyFPE_END_PROTECT(result)
- return PyComplex_FromCComplex(result);
- }
-
- static PyObject *
- complex_div(PyComplexObject *v, PyComplexObject *w)
- {
- Py_complex quot;
- PyFPE_START_PROTECT("complex_div", return 0)
- errno = 0;
- quot = c_quot(v->cval,w->cval);
- PyFPE_END_PROTECT(quot)
- if (errno == EDOM) {
- PyErr_SetString(PyExc_ZeroDivisionError, "complex division");
- return NULL;
- }
- return PyComplex_FromCComplex(quot);
- }
-
- static PyObject *
- complex_remainder(PyComplexObject *v, PyComplexObject *w)
- {
- Py_complex div, mod;
- errno = 0;
- div = c_quot(v->cval,w->cval); /* The raw divisor value. */
- if (errno == EDOM) {
- PyErr_SetString(PyExc_ZeroDivisionError, "complex remainder");
- return NULL;
- }
- div.real = floor(div.real); /* Use the floor of the real part. */
- div.imag = 0.0;
- mod = c_diff(v->cval, c_prod(w->cval, div));
-
- return PyComplex_FromCComplex(mod);
- }
-
-
- static PyObject *
- complex_divmod(PyComplexObject *v, PyComplexObject *w)
- {
- Py_complex div, mod;
- PyObject *d, *m, *z;
- errno = 0;
- div = c_quot(v->cval,w->cval); /* The raw divisor value. */
- if (errno == EDOM) {
- PyErr_SetString(PyExc_ZeroDivisionError, "complex divmod()");
- return NULL;
- }
- div.real = floor(div.real); /* Use the floor of the real part. */
- div.imag = 0.0;
- mod = c_diff(v->cval, c_prod(w->cval, div));
- d = PyComplex_FromCComplex(div);
- m = PyComplex_FromCComplex(mod);
- z = Py_BuildValue("(OO)", d, m);
- Py_XDECREF(d);
- Py_XDECREF(m);
- return z;
- }
-
- static PyObject *
- complex_pow(PyComplexObject *v, PyObject *w, PyComplexObject *z)
- {
- Py_complex p;
- Py_complex exponent;
- long int_exponent;
-
- if ((PyObject *)z!=Py_None) {
- PyErr_SetString(PyExc_ValueError, "complex modulo");
- return NULL;
- }
- PyFPE_START_PROTECT("complex_pow", return 0)
- errno = 0;
- exponent = ((PyComplexObject*)w)->cval;
- int_exponent = (long)exponent.real;
- if (exponent.imag == 0. && exponent.real == int_exponent)
- p = c_powi(v->cval,int_exponent);
- else
- p = c_pow(v->cval,exponent);
-
- PyFPE_END_PROTECT(p)
- if (errno == ERANGE) {
- PyErr_SetString(PyExc_ValueError,
- "0.0 to a negative or complex power");
- return NULL;
- }
- return PyComplex_FromCComplex(p);
- }
-
- static PyObject *
- complex_neg(PyComplexObject *v)
- {
- Py_complex neg;
- neg.real = -v->cval.real;
- neg.imag = -v->cval.imag;
- return PyComplex_FromCComplex(neg);
- }
-
- static PyObject *
- complex_pos(PyComplexObject *v)
- {
- Py_INCREF(v);
- return (PyObject *)v;
- }
-
- static PyObject *
- complex_abs(PyComplexObject *v)
- {
- double result;
- PyFPE_START_PROTECT("complex_abs", return 0)
- result = hypot(v->cval.real,v->cval.imag);
- PyFPE_END_PROTECT(result)
- return PyFloat_FromDouble(result);
- }
-
- static int
- complex_nonzero(PyComplexObject *v)
- {
- return v->cval.real != 0.0 || v->cval.imag != 0.0;
- }
-
- static int
- complex_coerce(PyObject **pv, PyObject **pw)
- {
- Py_complex cval;
- cval.imag = 0.;
- if (PyInt_Check(*pw)) {
- cval.real = (double)PyInt_AsLong(*pw);
- *pw = PyComplex_FromCComplex(cval);
- Py_INCREF(*pv);
- return 0;
- }
- else if (PyLong_Check(*pw)) {
- cval.real = PyLong_AsDouble(*pw);
- *pw = PyComplex_FromCComplex(cval);
- Py_INCREF(*pv);
- return 0;
- }
- else if (PyFloat_Check(*pw)) {
- cval.real = PyFloat_AsDouble(*pw);
- *pw = PyComplex_FromCComplex(cval);
- Py_INCREF(*pv);
- return 0;
- }
- return 1; /* Can't do it */
- }
-
- static PyObject *
- complex_int(PyObject *v)
- {
- PyErr_SetString(PyExc_TypeError,
- "can't convert complex to int; use e.g. int(abs(z))");
- return NULL;
- }
-
- static PyObject *
- complex_long(PyObject *v)
- {
- PyErr_SetString(PyExc_TypeError,
- "can't convert complex to long; use e.g. long(abs(z))");
- return NULL;
- }
-
- static PyObject *
- complex_float(PyObject *v)
- {
- PyErr_SetString(PyExc_TypeError,
- "can't convert complex to float; use e.g. abs(z)");
- return NULL;
- }
-
- static PyObject *
- complex_conjugate(PyObject *self, PyObject *args)
- {
- Py_complex c;
- if (!PyArg_ParseTuple(args, ":conjugate"))
- return NULL;
- c = ((PyComplexObject *)self)->cval;
- c.imag = -c.imag;
- return PyComplex_FromCComplex(c);
- }
-
- static PyMethodDef complex_methods[] = {
- {"conjugate", complex_conjugate, 1},
- {NULL, NULL} /* sentinel */
- };
-
-
- static PyObject *
- complex_getattr(PyComplexObject *self, char *name)
- {
- if (strcmp(name, "real") == 0)
- return (PyObject *)PyFloat_FromDouble(self->cval.real);
- else if (strcmp(name, "imag") == 0)
- return (PyObject *)PyFloat_FromDouble(self->cval.imag);
- else if (strcmp(name, "__members__") == 0)
- return Py_BuildValue("[ss]", "imag", "real");
- return Py_FindMethod(complex_methods, (PyObject *)self, name);
- }
-
- static PyNumberMethods complex_as_number = {
- (binaryfunc)complex_add, /*nb_add*/
- (binaryfunc)complex_sub, /*nb_subtract*/
- (binaryfunc)complex_mul, /*nb_multiply*/
- (binaryfunc)complex_div, /*nb_divide*/
- (binaryfunc)complex_remainder, /*nb_remainder*/
- (binaryfunc)complex_divmod, /*nb_divmod*/
- (ternaryfunc)complex_pow, /*nb_power*/
- (unaryfunc)complex_neg, /*nb_negative*/
- (unaryfunc)complex_pos, /*nb_positive*/
- (unaryfunc)complex_abs, /*nb_absolute*/
- (inquiry)complex_nonzero, /*nb_nonzero*/
- 0, /*nb_invert*/
- 0, /*nb_lshift*/
- 0, /*nb_rshift*/
- 0, /*nb_and*/
- 0, /*nb_xor*/
- 0, /*nb_or*/
- (coercion)complex_coerce, /*nb_coerce*/
- (unaryfunc)complex_int, /*nb_int*/
- (unaryfunc)complex_long, /*nb_long*/
- (unaryfunc)complex_float, /*nb_float*/
- 0, /*nb_oct*/
- 0, /*nb_hex*/
- };
-
- PyTypeObject PyComplex_Type = {
- PyObject_HEAD_INIT(&PyType_Type)
- 0,
- "complex",
- sizeof(PyComplexObject),
- 0,
- (destructor)complex_dealloc, /*tp_dealloc*/
- (printfunc)complex_print, /*tp_print*/
- (getattrfunc)complex_getattr, /*tp_getattr*/
- 0, /*tp_setattr*/
- (cmpfunc)complex_compare, /*tp_compare*/
- (reprfunc)complex_repr, /*tp_repr*/
- &complex_as_number, /*tp_as_number*/
- 0, /*tp_as_sequence*/
- 0, /*tp_as_mapping*/
- (hashfunc)complex_hash, /*tp_hash*/
- };
-
- #endif
-