Comment #6 on issue 2155 by asmeurer: lambdify() does not convert complex
quantities properly with the "numpy" option
http://code.google.com/p/sympy/issues/detail?id=2155
I've got a fix for this coming.
I was right about the atoms thing. THis also cased a problem in issue 2545
(there it was pi instead of I).
Regarding automatic translation from I to 1j, it's not as easy as I said,
because the translations are only designed to work from variable to
variable, and numpy (unlike mpmath) does not have a default variable
representing 1j.
So I've added in the functionality to define arbitrary default
translations, with I => 1j for numpy included as the first default.
Pull request coming soon...
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