#6756: [with patch, needs review] Implement ``diff`` format symbolic derivative
in
new symbolics
----------------------------+-----------------------------------------------
Reporter: gmhossain | Owner:
Type: enhancement | Status: new
Priority: major | Milestone:
Component: symbolics | Keywords:
Reviewer: Nick Alexander | Author: Golam Mortuza Hossain
Merged: |
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Comment(by burcin):
Replying to [comment:11 gmhossain]:
> (2) I don't think even D[] derivative output is much better in this
regard, specially if you implement and allow substitution of f(y,y). For
example. consider the substitution: f(y,y) = y in "D[0](f)(y, y) +
D[1](f)(y, y)", then you will get the same wrong answer from D[] as from
"diff".
This substitution doesn't make sense mathematically. D[0](f)(y,y) doesn't
contain f(y,y), there is nothing to substitute.
Bill Page had answered this point earlier:
http://groups.google.com/group/sage-devel/msg/e6ded8f5e28a5aab
This message by him in the same thread might be more helpful:
http://groups.google.com/group/sage-devel/msg/98cc070640578f0c
Note that with these patches, the result of `f(y,y).diff(y)` is twice that
of the current implementation.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6756#comment:12>
Sage <http://sagemath.org/>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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