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Jython is an implementation of the high-level, dynamic, object-oriented
language Python written in 100% Pure Java, and seamlessly integrated with
the Java platform. It thus allows you to run Python on any Java platform.
package org.python.modules;
import org.python.core.Py;
import org.python.core.PyComplex;
import org.python.core.PyFloat;
import org.python.core.PyInstance;
import org.python.core.PyObject;
import org.python.modules.math;
public class cmath {
public static PyFloat pi = new PyFloat(Math.PI);
public static PyFloat e = new PyFloat(Math.E);
private static PyComplex one = new PyComplex(1.0, 0.0);
private static PyComplex half = new PyComplex(0.5, 0.0);
private static PyComplex i = new PyComplex(0.0, 1.0);
private static PyComplex half_i = new PyComplex(0.0, 0.5);
private static PyComplex c_prodi(PyComplex x) {
return (new PyComplex(-x.imag, x.real));
}
private static double hypot(double x, double y) {
return (Math.sqrt(x * x + y * y));
}
private static PyComplex complexFromPyObject(PyObject obj) {
// If op is already of type PyComplex_Type, return its value
if (obj instanceof PyComplex) {
return (PyComplex)obj;
}
// If not, use op's __complex__ method, if it exists
PyObject newObj = null;
if (obj instanceof PyInstance) {
// this can go away in python 3000
if (obj.__findattr__("__complex__") != null) {
newObj = obj.invoke("__complex__");
}
// else try __float__
} else {
PyObject complexFunc = obj.getType().lookup("__complex__");
if (complexFunc != null) {
newObj = complexFunc.__call__(obj);
}
}
if (newObj != null) {
if (!(newObj instanceof PyComplex)) {
throw Py.TypeError("__complex__ should return a complex object");
}
return (PyComplex)newObj;
}
// If neither of the above works, interpret op as a float giving the real part of
// the result, and fill in the imaginary part as 0
return new PyComplex(obj.asDouble(), 0);
}
public static PyObject acos(PyObject in) {
PyComplex x = complexFromPyObject(in);
return (c_prodi(log(x.__add__(i
.__mul__(sqrt(one.__sub__(x.__mul__(x))))))).__neg__());
}
public static PyComplex acosh(PyObject in) {
PyComplex x = complexFromPyObject(in);
PyComplex r = null;
PyComplex a = sqrt(x.__sub__(one));
PyComplex b = sqrt(x.__add__(one));
PyComplex c = sqrt(half);
r = log(c.__mul__(b.__add__(a)));
return ((PyComplex) r.__add__(r));
}
public static PyComplex asin(PyObject in) {
PyComplex x = complexFromPyObject(in);
PyComplex r = null;
PyComplex squared = (PyComplex) x.__mul__(x);
PyComplex sq1_minus_xsq = sqrt(one.__sub__(squared));
r = (PyComplex) c_prodi(log(sq1_minus_xsq.__add__(c_prodi(x))))
.__neg__();
return (r);
}
public static PyComplex asinh(PyObject in) {
PyComplex x = complexFromPyObject(in);
PyComplex r = null;
PyComplex a = sqrt(x.__add__(i));
PyComplex b = sqrt(x.__sub__(i));
PyComplex z = sqrt(half);
r = log(z.__mul__(a.__add__(b)));
return ((PyComplex) r.__add__(r));
}
public static PyComplex atan(PyObject in) {
PyComplex x = complexFromPyObject(in);
PyComplex r = (PyComplex) half_i.__mul__(log(i.__add__(x).__div__(
i.__sub__(x))));
return (r);
}
public static PyComplex atanh(PyObject in) {
PyComplex x = complexFromPyObject(in);
PyComplex r = (PyComplex) half.__mul__(log(one.__add__(x).__div__(
one.__sub__(x))));
return (r);
}
public static PyComplex cos(PyObject in) {
PyComplex x = complexFromPyObject(in);
PyComplex r = new PyComplex(Math.cos(x.real) * math.cosh(x.imag), -Math
.sin(x.real)
* math.sinh(x.imag));
return (r);
}
public static PyComplex cosh(PyObject in) {
PyComplex x = complexFromPyObject(in);
PyComplex r = new PyComplex(Math.cos(x.imag) * math.cosh(x.real), Math
.sin(x.imag)
* math.sinh(x.real));
return (r);
}
public static PyComplex exp(PyObject in) {
PyComplex x = complexFromPyObject(in);
PyComplex r = new PyComplex(0.0, 0.0);
double l = Math.exp(x.real);
r.real = l * Math.cos(x.imag);
r.imag = l * Math.sin(x.imag);
return (r);
}
public static PyComplex log(PyObject in) {
PyComplex r = new PyComplex(0.0, 0.0);
PyComplex x = complexFromPyObject(in);
r.imag = Math.atan2(x.imag, x.real);
r.real = Math.log(hypot(x.real, x.imag));
return (r);
}
public static PyComplex log10(PyObject in) {
PyComplex r = new PyComplex(0.0, 0.0);
PyComplex x = complexFromPyObject(in);
double l = hypot(x.real, x.imag);
r.imag = Math.atan2(x.imag, x.real) / Math.log(10.0);
r.real = math.log10(new PyFloat(l));
return (r);
}
public static PyComplex log(PyObject in, PyObject base) {
return log(complexFromPyObject(in), base.asDouble());
}
public static PyComplex log(PyComplex x, double base) {
PyComplex r = new PyComplex(0.0, 0.0);
double l = hypot(x.real, x.imag);
double log_base = Math.log(base);
r.imag = Math.atan2(x.imag, x.real) / log_base;
r.real = math.log(new PyFloat(l)) / log_base;
return (r);
}
public static PyComplex sin(PyObject in) {
PyComplex r = new PyComplex(0.0, 0.0);
PyComplex x = complexFromPyObject(in);
r.real = Math.sin(x.real) * math.cosh(x.imag);
r.imag = Math.cos(x.real) * math.sinh(x.imag);
return (r);
}
public static PyComplex sinh(PyObject in) {
PyComplex r = new PyComplex(0.0, 0.0);
PyComplex x = complexFromPyObject(in);
r.real = Math.cos(x.imag) * math.sinh(x.real);
r.imag = Math.sin(x.imag) * math.cosh(x.real);
return (r);
}
public static PyComplex sqrt(PyObject in) {
PyComplex x = complexFromPyObject(in);
PyComplex r = new PyComplex(0.0, 0.0);
if ((x.real != 0.0) || (x.imag != 0.0)) {
double s = Math
.sqrt(0.5 * (Math.abs(x.real) + hypot(x.real, x.imag)));
double 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);
}
public static PyComplex tan(PyObject in) {
PyComplex x = complexFromPyObject(in);
PyComplex r = new PyComplex(0.0, 0.0);
double sr = Math.sin(x.real);
double cr = Math.cos(x.real);
double shi = math.sinh(x.imag);
double chi = math.cosh(x.imag);
double rs = sr * chi;
double is = cr * shi;
double rc = cr * chi;
double ic = -sr * shi;
double d = rc * rc + ic * ic;
r.real = ((rs * rc) + (is * ic)) / d;
r.imag = ((is * rc) - (rs * ic)) / d;
return (r);
}
public static PyComplex tanh(PyObject in) {
PyComplex x = complexFromPyObject(in);
PyComplex r = new PyComplex(0.0, 0.0);
double si = Math.sin(x.imag);
double ci = Math.cos(x.imag);
double shr = math.sinh(x.real);
double chr = math.cosh(x.real);
double rs = ci * shr;
double is = si * chr;
double rc = ci * chr;
double ic = si * shr;
double d = rc * rc + ic * ic;
r.real = ((rs * rc) + (is * ic)) / d;
r.imag = ((is * rc) - (rs * ic)) / d;
return (r);
}
}