[Tutor] cube root

[Brett Wilkins]

Hey Colin,

What you're running into here is the limited accuracy of floating point
values...
You'll likely find this happens a lot in python.. CPython, at least. (I
know, as I do)
I'm not sure, as I've never used it... but perhaps Numeric/Numpy handle
this kinda stuff better (for accuracy's sake)


Cheers,
--Brett

col speed wrote:
> Hi there, just a quick one.
> Is there a way to obtain cube roots in python?
> I have been trying:
> math.pow(n,1.0/3)
> This works with some, but with 64, for example I get:
> >>> pow(64,1.0/3)
> 3.9999999999999996
> However:
> >>> 4**3
> 64
> Any ideas?
> Thanks
> Colin
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