#8568: can not simplify derivative of erf
----------------------+-----------------------------------------------------
Reporter: gmcmanus | Owner: burcin
Type: defect | Status: needs_work
Priority: major | Milestone: sage-4.4.4
Component: calculus | Resolution: fixed
Keywords: | Author: Burcin Erocal, Karl-Dieter Crisman
Upstream: N/A | Reviewer: Karl-Dieter Crisman, Burcin Erocal
Merged: | Work_issues:
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Comment(by kcrisman):
Or not.
{{{
sage: maxima(derivative(ceil(d),d))
'diff('ceil(d),d,1)
sage: maxima(derivative(ceil(x*d),d))
<same NotImplementedError>
}}}
So the problem is that Burcin's Maxima conversion change now doesn't work
with
{{{
493 if (not all(is_SymbolicVariable(v) for v in args) or
494 len(args) != len(set(args))):
--> 495 raise NotImplementedError, "arguments must be distinct
variables"
496
497 f = operator.function()
}}}
in derivative(). In fact, he even included a doctest for it!
{{{
We can only convert to Maxima derivatives if the corresponding operand of
the function is a variable::
sage: y = var('y')
sage: t = f(x*y).diff(x)
sage: m.derivative(t, t.operator())
Traceback (most recent call last):
...
NotImplementedError: arguments must be distinct variables
}}}
This example could be fixed if one fixed
{{{
sage: derivative(ceil(x),x)
D[0](ceil)(x)
}}}
so that there isn't a derivative function defined for ceil. I'm not sure
exactly what would count, though... just the zero function?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8568#comment:12>
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