sympy/sympy — pull request #1348 by catchmrbharath (2012-06-12 11:36:44+00:00)
Title: Complex values are discarded in plots

If a complex value is encountered while plotting, it is masked
using a numpy masked array and the complex value is not plotted in
the plot.

The only problem with this is is plots of `sqrt(x)` appear cut, if 0 is not
an sample. I plan to fix the problem using adaptive sampling for which I
will send another pull request.