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Topic: Matlab wrong cubic root
Replies: 3   Last Post: Dec 15, 2012 9:05 PM

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Posts: 55
Registered: 12/11/12
Re: Matlab wrong cubic root
Posted: Dec 15, 2012 9:05 PM
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W dniu 2012-12-15 19:19, pisze:
> Hello all,
> Is there a way of telling matlab to return first a real root
> instead of a complex one?
> For some strange reason matlab seems not to handle cubic roots
> properly. Apparently the default behaviour is to first
> report a complex root. Let's see two examples:

>>> (-1/2)^(1/3)
> ans =
> 0.3969 + 0.6874i


>>> (-1/2)^(2/3)
> ans =
> -0.3150 + 0.5456i


I'm afraid this is the simplest way, but I'm not sure.


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