#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: |
----------------------------+-----------------------------------------------
Comment(by burcin):
Replying to [comment:13 gmhossain]:
> Replying to [comment:12 burcin]:
> > Note that with these patches, the result of `f(y,y).diff(y)` is twice
that of the current implementation.
>
> This is not accurate.
>
> Above will happen only when an user wants to apply chain rule by
explicitly setting
> diff_derivative_level to "2" or more and certainly NOT in default diff
level of "1".
> If some user wants to use some setting that are not default then its
reasonable to
> expect users to read the documentation to be aware of the assumptions
associated with
> the settings.
So you agree that setting this level to 2 gives wrong results. In
comment:10, I tried to say that this option that gives wrong results
should be removed.
We can then merge this ''inert'' derivative with the global `diff` command
by adding a keyword option `hold`. E.g.,
{{{
sage: f(y,y).diff(y,1)
D[0](f)(y, y) + D[1](f)(y, y)
sage: f(y,y).diff(y,1,hold=True)
diff(f(y, y), y, 1)
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6756#comment:14>
Sage <http://sagemath.org/>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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