Hi Burcin:
When using Sage for my work i makes heavy use of dictionaries to
substitute values for derivatives of symbolic functions. Thanks for
your help on fixing this bug for Sage 4.1.1.
Alex
On Jun 8, 7:12 am, Burcin Erocal <bur...@erocal.org> wrote:
> Hi Alex,
>
> On Sun, 7 Jun 2009 11:31:26 -0700 (PDT)
>
>
>
> Alex Raichev <tortoise.s...@gmail.com> wrote:
>
> > Hi all:
>
> > Upon upgrading to Sage 4.0, i can no longer make a dictionary with
> > derivatives as keys (see below). Can someone please fix this?
> > ----------------------------------------------------------------------
> > | Sage Version 4.0, Release Date: 2009-05-29 |
> > | Type notebook() for the GUI, and license() for information. |
> > ----------------------------------------------------------------------
> > sage: X= var('x,y')
> > sage: f= function('f',*X); f
> > f(x, y)
> > sage: for x in X:
> > ....: diff(f,x)
> > ....:
> > D[0](f)(x, y)
> > D[1](f)(x, y)
> > sage: d= {}
> > sage: for x in X:
> > ....: d[diff(f,x)] = 1
> > ....:
>
> <snip>
>
>
>
> > /Applications/sage/local/lib/python2.5/site-packages/sage/rings/
> > complex_interval_field.pyc in __call__(self, x, im)
> > 286
> > 287 try:
> > --> 288 return x._complex_mpfi_( self )
> > 289 except AttributeError:
> > 290 pass
>
> > /Applications/sage/local/lib/python2.5/site-packages/sage/symbolic/
> > expression.so in sage.symbolic.expression.Expression._complex_mpfi_
> > (sage/symbolic/expression.cpp:5484)()
> <snip>
> > /Applications/sage/local/lib/python2.5/site-packages/sage/symbolic/
> > expression_conversions.pyc in derivative(self, ex, operator)
> > 344 NotImplementedError: derivative
> > 345 """
> > --> 346 raise NotImplementedError, "derivative"
> > 347
> > 348 def arithmetic(self, ex, operator):
>
> > NotImplementedError: derivative
>
> I opened a ticket for this:
>
> http://trac.sagemath.org/sage_trac/ticket/6243
>
> As I wrote on the ticket, I believe the correct fix is to change pynac
> to handle more general numerical approximations. I will try to get this
> done until the next release.
>
> There might be an easier fix by implementing the derivative method in
> sage.symbolic.expression_conversions.Converter. Maybe Mike can comment
> on that.
>
> Thanks.
>
> Burcin
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