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Which software (preferably: free/open source) can one use to graphically represent a complex function? I know that real functions can be easily represented with Octave or R; what can you recommend for complex functions?

Thanks in advance, Lucian

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    [WolframAlpha](http://www.wolframalpha.com/input/?i=RiemannZeta%28x%2Biy%29)2012-07-24
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    The article "Phase Plots of Complex Functions" in the [June 2011 _AMS Notices_](http://www.ams.org/notices/201106/index.html) may have some relevant information.2012-07-24

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