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- /* Complex math module */
-
- /* much code borrowed from mathmodule.c */
-
- #include "allobjects.h"
- #include "complexobject.h"
-
- #include <errno.h>
-
- #include "mymath.h"
- #include "protos/cmathmodule_protos.h"
-
- #ifdef i860
- /* Cray APP has bogus definition of HUGE_VAL in <math.h> */
- #undef HUGE_VAL
- #endif
-
- #ifdef HUGE_VAL
- #define CHECK(x) if (errno != 0) ; \
- else if (-HUGE_VAL <= (x) && (x) <= HUGE_VAL) ; \
- else errno = ERANGE
- #else
- #define CHECK(x) /* Don't know how to check */
- #endif
-
- #ifndef M_PI
- #define M_PI (3.141592653589793239)
- #endif
-
- /* First, the C functions that do the real work */
-
- /* constants */
- static Py_complex c_1 = {1., 0.};
- static Py_complex c_half = {0.5, 0.};
- static Py_complex c_i = {0., 1.};
- static Py_complex c_i2 = {0., 0.5};
- static Py_complex c_mi = {0., -1.};
- static Py_complex c_pi2 = {M_PI/2., 0.};
-
- /* forward declarations */
- staticforward Py_complex c_log();
- staticforward Py_complex c_prodi();
- staticforward Py_complex c_sqrt();
-
-
- static Py_complex c_acos(x)
- Py_complex x;
- {
- return c_neg(c_prodi(c_log(c_sum(x,c_prod(c_i,
- c_sqrt(c_diff(c_1,c_prod(x,x))))))));
- }
-
- static Py_complex c_acosh(x)
- Py_complex x;
- {
- return c_log(c_sum(x,c_prod(c_i,
- c_sqrt(c_diff(c_1,c_prod(x,x))))));
- }
-
- static Py_complex c_asin(x)
- Py_complex x;
- {
- return c_neg(c_prodi(c_log(c_sum(c_prod(c_i,x),
- c_sqrt(c_diff(c_1,c_prod(x,x)))))));
- }
-
- static Py_complex c_asinh(x)
- Py_complex x;
- {
- return c_neg(c_log(c_diff(c_sqrt(c_sum(c_1,c_prod(x,x))),x)));
- }
-
- static Py_complex c_atan(x)
- Py_complex x;
- {
- return c_prod(c_i2,c_log(c_quot(c_sum(c_i,x),c_diff(c_i,x))));
- }
-
- static Py_complex c_atanh(x)
- Py_complex x;
- {
- return c_prod(c_half,c_log(c_quot(c_sum(c_1,x),c_diff(c_1,x))));
- }
-
- static Py_complex c_cos(x)
- Py_complex x;
- {
- Py_complex r;
- r.real = cos(x.real)*cosh(x.imag);
- r.imag = -sin(x.real)*sinh(x.imag);
- return r;
- }
-
- static Py_complex c_cosh(x)
- Py_complex x;
- {
- Py_complex r;
- r.real = cos(x.imag)*cosh(x.real);
- r.imag = sin(x.imag)*sinh(x.real);
- return r;
- }
-
- static Py_complex c_exp(x)
- Py_complex x;
- {
- Py_complex r;
- double l = exp(x.real);
- r.real = l*cos(x.imag);
- r.imag = l*sin(x.imag);
- return r;
- }
-
- static Py_complex c_log(x)
- Py_complex x;
- {
- Py_complex r;
- double l = hypot(x.real,x.imag);
- r.imag = atan2(x.imag, x.real);
- r.real = log(l);
- return r;
- }
-
- static Py_complex c_log10(x)
- Py_complex x;
- {
- Py_complex r;
- double l = hypot(x.real,x.imag);
- r.imag = atan2(x.imag, x.real)/log(10.);
- r.real = log10(l);
- return r;
- }
-
- static Py_complex c_prodi(x)
- Py_complex x;
- {
- Py_complex r;
- r.real = -x.imag;
- r.imag = x.real;
- return r;
- }
-
- static Py_complex c_sin(x)
- Py_complex x;
- {
- Py_complex r;
- r.real = sin(x.real)*cosh(x.imag);
- r.imag = cos(x.real)*sinh(x.imag);
- return r;
- }
-
- static Py_complex c_sinh(x)
- Py_complex x;
- {
- Py_complex r;
- r.real = cos(x.imag)*sinh(x.real);
- r.imag = sin(x.imag)*cosh(x.real);
- return r;
- }
-
- static Py_complex c_sqrt(x)
- Py_complex x;
- {
- Py_complex r;
- double s,d;
- if (x.real == 0. && x.imag == 0.)
- r = x;
- else {
- s = sqrt(0.5*(fabs(x.real) + hypot(x.real,x.imag)));
- d = 0.5*x.imag/s;
- if (x.real > 0.) {
- r.real = s;
- r.imag = d;
- }
- else if (x.imag >= 0.) {
- r.real = d;
- r.imag = s;
- }
- else {
- r.real = -d;
- r.imag = -s;
- }
- }
- return r;
- }
-
- static Py_complex c_tan(x)
- Py_complex x;
- {
- Py_complex r;
- double sr,cr,shi,chi;
- double rs,is,rc,ic;
- double d;
- sr = sin(x.real);
- cr = cos(x.real);
- shi = sinh(x.imag);
- chi = cosh(x.imag);
- rs = sr*chi;
- is = cr*shi;
- rc = cr*chi;
- ic = -sr*shi;
- d = rc*rc + ic*ic;
- r.real = (rs*rc+is*ic)/d;
- r.imag = (is*rc-rs*ic)/d;
- return r;
- }
-
- static Py_complex c_tanh(x)
- Py_complex x;
- {
- Py_complex r;
- double si,ci,shr,chr;
- double rs,is,rc,ic;
- double d;
- si = sin(x.imag);
- ci = cos(x.imag);
- shr = sinh(x.real);
- chr = cosh(x.real);
- rs = ci*shr;
- is = si*chr;
- rc = ci*chr;
- ic = si*shr;
- d = rc*rc + ic*ic;
- r.real = (rs*rc+is*ic)/d;
- r.imag = (is*rc-rs*ic)/d;
- return r;
- }
-
-
- /* And now the glue to make them available from Python: */
-
- static object *
- math_error()
- {
- if (errno == EDOM)
- err_setstr(ValueError, "math domain error");
- else if (errno == ERANGE)
- err_setstr(OverflowError, "math range error");
- else
- err_errno(ValueError); /* Unexpected math error */
- return NULL;
- }
-
- static object *
- math_1(args, func)
- object *args;
- Py_complex (*func) FPROTO((Py_complex));
- {
- Py_complex x;
- if (!PyArg_ParseTuple(args, "D", &x))
- return NULL;
- errno = 0;
- x = (*func)(x);
- CHECK(x.real);
- CHECK(x.imag);
- if (errno != 0)
- return math_error();
- else
- return newcomplexobject(x);
- }
-
- #define FUNC1(stubname, func) \
- static object * stubname(self, args) object *self, *args; { \
- return math_1(args, func); \
- }
-
- FUNC1(cmath_acos, c_acos)
- FUNC1(cmath_acosh, c_acosh)
- FUNC1(cmath_asin, c_asin)
- FUNC1(cmath_asinh, c_asinh)
- FUNC1(cmath_atan, c_atan)
- FUNC1(cmath_atanh, c_atanh)
- FUNC1(cmath_cos, c_cos)
- FUNC1(cmath_cosh, c_cosh)
- FUNC1(cmath_exp, c_exp)
- FUNC1(cmath_log, c_log)
- FUNC1(cmath_log10, c_log10)
- FUNC1(cmath_sin, c_sin)
- FUNC1(cmath_sinh, c_sinh)
- FUNC1(cmath_sqrt, c_sqrt)
- FUNC1(cmath_tan, c_tan)
- FUNC1(cmath_tanh, c_tanh)
-
-
- static struct methodlist cmath_methods[] = {
- {"acos", cmath_acos, 1},
- {"acosh", cmath_acosh, 1},
- {"asin", cmath_asin, 1},
- {"asinh", cmath_asinh, 1},
- {"atan", cmath_atan, 1},
- {"atanh", cmath_atanh, 1},
- {"cos", cmath_cos, 1},
- {"cosh", cmath_cosh, 1},
- {"exp", cmath_exp, 1},
- {"log", cmath_log, 1},
- {"log10", cmath_log10, 1},
- {"sin", cmath_sin, 1},
- {"sinh", cmath_sinh, 1},
- {"sqrt", cmath_sqrt, 1},
- {"tan", cmath_tan, 1},
- {"tanh", cmath_tanh, 1},
- {NULL, NULL} /* sentinel */
- };
-
- void
- initcmath()
- {
- object *m, *d, *v;
-
- m = Py_InitModule("cmath", cmath_methods);
- d = getmoduledict(m);
- dictinsert(d, "pi", v = newfloatobject(atan(1.0) * 4.0));
- DECREF(v);
- dictinsert(d, "e", v = newfloatobject(exp(1.0)));
- DECREF(v);
- }
-