On Thu, Apr 17, 2008 at 10:45 AM, Friedrich Hagedorn <[EMAIL PROTECTED]> wrote:
>
>  Hello again,
>
>  I have one more task for subs. Supose one have a term and a function
>  like this:
>
>  In [1]: fxy = f(x) + f(y)
>
>  In [2]: g = Lambda(x, x + x**2)
>
>  And now I want to do easily
>
>  In [4]: fxy.subs(f, g)
>  Out[4]: f(x) + f(y)
>
>  But I must do the cumbersone way
>
>  In [3]: fxy.subs(f(x), g(x)).subs(f(y), g(y))
>  Out[3]:
>          2    2
>  x + y + x  + y
>
>  Any advice?

This way of functions substitutions are not implemented. This is now:

http://code.google.com/p/sympy/issues/detail?id=792

Ondrej

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