[Jython-bugs] [issue2160] cmath.polar gives incorrect result

[Tobias <re...@bu...>]

New submission from Tobias:

The function cmath.polar(x) returns a tuple (r, phi) where r should be the absolute value of x: r = abs(x). For instance, "polar(3+4j)" should return (5.0, 0.927) but Jython 2.7's value is (7.0, 0.927) instead.

This could be fixed by changing the way "r" is computed inside the "polar"-function in "cmath.java" to:

    public static PyTuple polar(PyObject in) {
        PyComplex z = complexFromPyObject(in);
        double phi = Math.atan2(z.imag, z.real);
        double r = Math.sqrt(z.real*z.real + z.imag*z.imag);  // <- Changed
        return new PyTuple(new PyFloat(r), new PyFloat(phi));
    }

----------
components: Library
messages: 8596
nosy: tkohn
severity: normal
status: open
title: cmath.polar gives incorrect result
type: behaviour

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Jython tracker <re...@bu...>
<http://bugs.jython.org/issue2160>
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