simplify_full() Maxima ECL error

asked 2015-03-02 16:38:48 -0600

NahsiN gravatar image

updated 2015-07-13 13:30:06 -0600

Hi all, the following code was working fine in 6.4.1 (I am using the AIIMS ppa in Ubuntu) and now after the 6.5 upgrade, it doesn't work anymore. Assume I have defined all variables.

u(t) = exp(-(t-t_0)^2/(2*sigma^2)) + exp(-(t-t_1)^2/(2*sigma^2)) ; u(t);
u_tilde = integral(u(t)*exp(-I*omega*t), t, -infinity, +infinity, hold=False).simplify_full(); u_tilde;

The problem is in simplify_full(). The erf function and their limits are not evaluated for some reason. I have a hunch this problem has been posted before but I am not sure. The full traceback is given below. Any help is appreciated. Thanks

    ---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-8-66e6236c7bf7> in <module>()
----> 1 u_tilde = integral(u(t)*exp(-I*omega*t), t, -infinity, +infinity, hold=False).simplify_full(); u_tilde;

/usr/lib/sagemath/src/sage/symbolic/expression.pyx in sage.symbolic.expression.Expression.simplify_full (build/cythonized/sage/symbolic/expression.cpp:40350)()
   8258         """
   8259         x = self
-> 8260         x = x.simplify_factorial()
   8261         x = x.simplify_rectform()
   8262         x = x.simplify_trig()

/usr/lib/sagemath/src/sage/symbolic/expression.pyx in sage.symbolic.expression.Expression.simplify_factorial (build/cythonized/sage/symbolic/expression.cpp:43472)()
   8729 
   8730         """
-> 8731         return self.parent()(self._maxima_().makefact().factcomb().minfactorial())
   8732 
   8733     factorial_simplify = simplify_factorial

/usr/lib/sagemath/src/sage/symbolic/expression.pyx in sage.symbolic.expression.Expression._maxima_ (build/cythonized/sage/symbolic/expression.cpp:5512)()
    582             # Maybe not such a great idea because the "default" interface is another one
    583             from sage.calculus.calculus import maxima
--> 584             return super(Expression, self)._interface_(maxima)
    585         else:
    586             return super(Expression, self)._interface_(session)

/usr/lib/sagemath/src/sage/structure/sage_object.pyx in sage.structure.sage_object.SageObject._interface_ (build/cythonized/sage/structure/sage_object.c:5203)()
    592                 raise NotImplementedError, "coercion of object %s to %s not implemented:\n%s\n%s"%\
    593                   (repr(self), I)
--> 594         X = I(s)
    595         if c:
    596             try:

/usr/lib/sagemath/local/lib/python2.7/site-packages/sage/interfaces/interface.pyc in __call__(self, x, name)
    197 
    198         if isinstance(x, basestring):
--> 199             return cls(self, x, name=name)
    200         try:
    201             return self._coerce_from_special_method(x)

/usr/lib/sagemath/local/lib/python2.7/site-packages/sage/interfaces/interface.pyc in __init__(self, parent, value, is_name, name)
    624                 self._name = parent._create(value, name=name)
    625             except (TypeError, RuntimeError, ValueError) as x:
--> 626                 raise TypeError(x)
    627 
    628     def _latex_(self):

TypeError: ECL says: Error executing code in Maxima:

Update: I would like to add that the latest version of sage 6.7 still has this problem. Any updates?

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Comments

rws gravatar imagerws ( 2015-03-04 09:41:36 -0600 )edit

Thank you for filing a ticket. Hopefully it's fixed soon.

NahsiN gravatar imageNahsiN ( 2015-03-11 14:35:01 -0600 )edit

The same issue arises in sage 6.7. It seemed to have been fixed in 6.6 but it's back in 6.7.

NahsiN gravatar imageNahsiN ( 2015-07-13 11:34:27 -0600 )edit