On 5/7/07, Nick Alexander <[EMAIL PROTECTED]> wrote:
> The following transcript shows some problems with the new (and rather
> cool) symbolic package. Perhaps someone in the know could address
> them, or file the relevant trac issue?
Nick,
I tried these examples in sage-2.5.alpha3 on several platforms
and in all cases they work perfectly. What version of SAGE, what
platform, etc.?
>
> Nick
>
> sage: exp(x*t).diff(t, 2)
> xe
>
> sage: exp(x^2*t).diff(t, 2)
> xe
>
> sage: exp(x^2*e^t).diff(t, 2)
> ---------------------------------------------------------------------------
> <type 'exceptions.TypeError'> Traceback (most recent call last)
>
> /Users/nalexand/Documents/School/MATH235/<ipython console> in <module>()
>
> /Users/nalexand/sage/local/lib/python2.5/site-packages/sage/calculus/calculus.py
> in derivative(self, *args)
> 1058 pass
> 1059 t = maxima('diff(%s, %s)'%(self._maxima_().name(), s))
> -> 1060 f = self.parent()(t)
> 1061 return f
> 1062
>
> /Users/nalexand/sage/local/lib/python2.5/site-packages/sage/calculus/calculus.py
> in __call__(self, x)
> 281 elif hasattr(x, '_symbolic_'):
> 282 return x._symbolic_(self)
> --> 283 return self._coerce_impl(x)
> 284
> 285 def _coerce_impl(self, x):
>
> /Users/nalexand/sage/local/lib/python2.5/site-packages/sage/calculus/calculus.py
> in _coerce_impl(self, x)
> 289 return x
> 290 elif isinstance(x, MaximaElement):
> --> 291 return symbolic_expression_from_maxima_element(x)
> 292 elif is_Polynomial(x) or is_MPolynomial(x):
> 293 return SymbolicPolynomial(x)
>
> /Users/nalexand/sage/local/lib/python2.5/site-packages/sage/calculus/calculus.py
> in symbolic_expression_from_maxima_element(x)
> 4411
> 4412 def symbolic_expression_from_maxima_element(x):
> -> 4413 return symbolic_expression_from_maxima_string(x.name())
> 4414
> 4415 def evaled_symbolic_expression_from_maxima_string(x):
>
> /Users/nalexand/sage/local/lib/python2.5/site-packages/sage/calculus/calculus.py
> in symbolic_expression_from_maxima_string(x, equals_sub, maxima)
> 4406 return x
> 4407 except SyntaxError:
> -> 4408 raise TypeError, "unable to make sense of Maxima expression
> '%s' in SAGE"%s
> 4409 finally:
> 4410 is_simplified = False
>
> <type 'exceptions.TypeError'>: unable to make sense of Maxima expression
> 'x(ex+1)e' in SAGE
>
> sage: exp(x^2*e^t).diff(t, 1)
> xe
>
> sage: exp(x^2*e^t).diff(t)
> xe
>
> sage: exp(x^2*exp(t)).diff(t)
> xe
>
> >
>
--
William Stein
Associate Professor of Mathematics
University of Washington
http://www.williamstein.org
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