#17445: Missing documentation of derivative operator/notation
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Reporter: schymans | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-6.5
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: schymans | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by schymans):
Wow, I think the description of this ticket should be changed. It is not
any more about the documentation of the D[] notation, but about a
meaningful way of using and displaying symbolic differentials.
One thing I learned from this post:
http://trac.sagemath.org/ticket/17447#comment:3 is:
The example I used in the description of the ticket, and most of the
examples following, should not be used!
If we avoid this, then we are stuck with the problem that the diff()
method is not defined for symbolic functions:
{{{
sage: var('x')
sage: function('f', x)
sage: print type(g)
sage: p = f.diff()
<class 'sage.symbolic.function_factory.NewSymbolicFunction'>
Traceback (click to the left of this block for traceback)
...
AttributeError: 'NewSymbolicFunction' object has no attribute 'diff'
}}}
What is the point of having a notation for differentials of symbolic
functions, then? Should the first step not be to actually implement
differentiation of symbolic functions and then explain the notation in the
documentation of function?
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Ticket URL: <http://trac.sagemath.org/ticket/17445#comment:18>
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