Comment #4 on issue 2414 by [email protected]: [Feature request] Deferred expressions
http://code.google.com/p/sympy/issues/detail?id=2414

Looking at this further, I think what I'm looking for could be managed by just having a way for ccode() to create a new variable for each unevaluated expression it runs into. So

ccode(sin(Derivative(x**2*y,x)), assign_to='out')

would create something like

double t1 = 2*x*y;
out = sin(t1);

instead of the current "Not C" stuff.

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