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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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    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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You may find this link helpful. You might also enjoy this book's approach to complex variable.

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You can try sage at http://www.sagemath.org/

Edit by Rahul: SAGE has a complex_plot function which visualizes complex functions using domain colouring. An example can be seen in this blog post about SAGE 3.4.1.

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    @Rahul : Thanks for the edit! (As a general comment to the OP and others, _Sage_ is an incredibly powerful _suite_ of mathematical software; on the flip side, because it is [so powerful](http://www.sagemath.org/links-components.html), answers pointing to the use of Sage can really benefit from a brief description of what components to use and how to use them.)2012-07-27