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I need something like the cubic function $y=x^3$ rotated 90 degrees. Which function is that?

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$y=-\root3\of x$

${}{}{}{}{}{}{}$

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    But x cannot be negative using this function. Are there other ways?2012-01-30
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    @Linksku: yes it can.2012-01-30
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    I'm not very good at functions. According to the following link, if x is negative, then it curves downwards: http://www.wolframalpha.com/input/?i=plot+y%3D-x%5E%281%2F3%29 Am I missing something?2012-01-30
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    Try [this](http://www.wolframalpha.com/input/?i=y+%3D+-sgn%28x%29*abs%28x%29%5E%281%2F3%29). (Wolframalpha only seems to know the complex variant of the cube root.)2012-01-30