"Daniel Schüle" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > > I agree that this is a deficiency. I would think .angle() should be a > > I don't know what nomenclature is used in english speaking > mathematical world for angle of a complex number > I learned it in german as Arg(z) .. Arg standing for argument > you see, we would have named it differently, hence making > it difficult for the reader, eventually creating redundancy
I am aware of the usage of argument to mean the angle in polar representation, but I don't like it. The word argument already has two other meanings, one in common English, the other in math/CS. The latter meaning is the inputs to a function, and that is how the word is used in Python (though the former applies more to many c.l.p threads ;-) To me, the polar angle has no connection with either meaning and so the usage is 'like Greek' to me. Whereas angle is exactly what it is. As for Greek: I first learned r(adius),theta (versus x,y or real,imag) as the names for polar coordinates or the polar representation for complex numbers and only ran into arg much later in some contexts. And I have seen complex number implementations that use the equivalent of c.r() and c.theta(). But I did not suggest that for one of the reasons I don't like 'lambda': its fine if you already know it and arbitrary if you don't. (Is theta used in Germany?) > > It is possible that a cmath2 module, written in Python, could be > > useful. > > I hope so > I will google for cmath2, I never heard about it That is because we have not written it yet. The allroots function could be the first addition, if it is not present elsewhere. The 'could be' was meant in the sense of 'if someone were to write it' rather than 'if you were to read it' ;-) Terry J. Reedy
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