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# How to make the result of a cubic root definite?

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Why in matlab the result of a cubic root can be correct, but not unambiguous?
For example,

``````& gt; & gt; (-5-3) ^ (1/3)
ANS =.
1.0000 + 1.7321i
``````

And if immediately:

``````& gt; & gt; -8 ^ (1/3)
ANS =.
-2.
``````

It is clear that in both cases a cubic root is extracted from -8, but the answer is different, although the right one in both cases.

How can you control which result you need to get – integrated or valid?

## Answer 1, Authority 100%

You can nthroot Use to calculate the real value of the root N-th degree.

Judging by Documentation Operator A. ^ b For negative A and fractional B module less 1 will always return the integrated value of the root.

If it happened, as you describe, then in the unary – priority is lower than y ^, do so (-8) ^ (1/3) – and get the expected comprehensive result.

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