[Numpy-discussion] method to calculate the magnitude squared

Charles R Harris charlesr.harris at gmail.com
Sat Oct 10 13:50:32 EDT 2015

On Sat, Oct 10, 2015 at 11:14 AM, Marten van Kerkwijk <
m.h.vankerkwijk at gmail.com> wrote:

> > We tend to avoid adding methods. 2) would be a very easy enhancement,
> just a slight modification of sqr.
> Did you mean `np.square`? Sadly, that doesn't do the right thing:
> `np.square(1+1j)` yields `2j`, while one wants `c*c.conj()` and thus `2`.
> Or, for fastest speed, really just `c.real**2 + c.imag**2`.

Yes, I meant the new function could made by reusing the square code with
slight modifications.

> My guess would be that a new ufunc, say `np.abs2` or `np.modulus2` or so,
> would be more appropriate than defining a new method. I'd also be hesitant
> to define a new private method -- I like how those usually are just used to
> override python basics.

Julia uses abs2.

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