Comment #21 on issue 1620 by [email protected]: Allow derivatives of unknown functions evaluated at a point
http://code.google.com/p/sympy/issues/detail?id=1620
I don't see to where all of this converges. Functions as objects are not feasible right now, even operations (sum, product etc.) on Lambda don't work -- even if it gives a result, that result won't behave like a Lambda (it can't be __call__'ed).
I also don't get how to make D(f)(x) a common sympy object: what are .func and .args?
Looking at the Maple docs from #c7, I noticed that in expression 3.4 it says that derivatives evaluated at a point in the "diff" form must be expressed using diff and eval. That to me looks like a common (sympy's) diff with subs() at a point, but Maple handles "unevaluated subs". Creating an object of this kind is another way of solving the issue. What do you think?
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