Wouldn't you just use the .subs() method, or does that not work?
Aaron Meurer
On Jun 13, 2010, at 6:57 AM, Alan Bromborsky wrote:
> How would I do the following:
>
> I have a generic function: d_1 = Function('d_1')(x)
>
> that I apply to another function f in an expression such as y =
> 5*x_1**2+d_1(f).
>
> Later I wish to substitute an explicit function such as
>
> def D_1(f):
> return(diff(f,x_1))
>
> for d_1 and have y expanded after the substitution. For example if f =
> x_1**2+x_2**2 then
> y = 5*x_1**2+2*x_1
>
>
>
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