#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 nbruin):
Replying to [comment:9 schymans]:
> {{{
> print p.subs_expr(f==g) # Outputs "D[0](f)(x)"
> }}}
Because you need `subs_function` there. These are two different routines
that take different types of arguments and do different things with them.
Objects of type `SymbolicFunction` cannot be used interchangeably with
`SymbolicExpression`.
We could in principle extend `subs` to differentiate on type of passed
argument and dispatch accordingly to `subs_function` or `subs_expression`
(and raise an error if some impossible combination is tried).
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Ticket URL: <http://trac.sagemath.org/ticket/17445#comment:14>
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