Updates:
Status: Fixed
Labels: Printing
Comment #2 on issue 1527 by asmeurer: bug in the printer (function + subs)
http://code.google.com/p/sympy/issues/detail?id=1527
This was fixed with the commit
commit aeb80f87a16fad38ffc44b18aa52d739519e003b
Author: Chris Smith <smi...@gmail.com>
Date: Mon Sep 6 10:07:26 2010 +0545
2049: don't set evaluate to True when doing subs
If you want doit done then you have to do so after the subs
or write a custom routine to do so for you.
In [1]: F = Function('F')
In [2]: x, y, t = symbols('x y t')
In [3]: a = Symbol('a', Real=True)
In [4]: eq = Derivative(F(x, t), x)
In [5]: eq
Out[5]:
d
──(F(x, t))
dx
In [6]: pat = -33*t*x + F(x + exp(-t))
In [7]: pat
Out[7]:
⎛ -t⎞
-33⋅t⋅x + F⎝x + ℯ ⎠
In [8]: sub = eq.subs(F(x, t), pat)
In [9]: sub
Out[9]:
d ⎛ ⎛ -t⎞⎞
──⎝-33⋅t⋅x + F⎝x + ℯ ⎠⎠
dx
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