# [Numpy-discussion] complex numbers

David L Goldsmith David.L.Goldsmith at noaa.gov
Tue Oct 3 15:33:19 CDT 2006

```PS:  The Python built in function (i.e., you don't even need numpy for
this) abs(x) is "vectorized" (i.e., accepts a (nested) sequence, incl.
numpy array, argument) and overloaded to give the modulus (i.e.,
Pythagorean "length") of a complex number when such is its argument.

DG

Kenny Ortmann wrote:
> excuse my laziness for not looking this up, I googled it but could not find
> a solution.
> matlab has a
> isreal(array)
> where if the array is full of real numbers the value returned is 1.
> I'm translating matlab code and ran across
>
> if ~isreal(array)
>     array = abs(array)
>
> Is there a way to check to see if a number is real or complex? and if so is
> there a way to extract the(a + ib) because the absolute value of a complex
> number is like the pythagorean therom on a and b?
>
> Kenny
>
>
>
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