#6344: Typesetting partial derivatives in new symbolics
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Reporter: gmhossain | Owner: burcin
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-6.4
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: Burcin Erocal | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by nbruin):
Replying to [comment:13 schymans]:
> All I wanted to do is to change the _latex_ representation of the
FDerivativeOperator and added the following lines to
src/sage/symbolic/operators.py:
Looks like the wrong place to hook into this. For symbolic expressions.
`self._latex_` invokes `SR._latex_element_` which calls straight into
Pynac via ` GEx_to_str_latex(&x._gobj)`. Your experiment shows that this
doesn't dispatch to `_latex_` methods on operators. Perhaps there's
another hook?
Incidentally, your code wouldn't work, because that's not how
FDerivateOperators occur in code:
{{{
sage: var("x,y")
(x, y)
sage: function('f',x,y)
f(x, y)
sage: g=diff(f(x,y),x,y)
sage: g
D[0, 1](f)(x, y)
sage: g.operator()
D[0, 1](f)
sage: type(g.operator())
<class 'sage.symbolic.operators.FDerivativeOperator'>
sage: g.operator()._f
f
}}}
As you can see, there are no variable names to refer to. That's why this
ticket has stalled: if you want to do this, you need to recognize on the
level of `g` that the operator is an `FDerivativeOperator` and hence that,
if the operands of `g` are distinct, simple symbolic variables, that the
derivative could be written in Leibnitz notation.
Clearly, people haven't found the effort required worth the payoff.
--
Ticket URL: <http://trac.sagemath.org/ticket/6344#comment:15>
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