#8056: symbolic expressions involving rational functions with numerator 1 cannot
be converted to fast callable
-----------------------------+----------------------------------------------
Reporter: burcin | Owner: burcin
Type: defect | Status: needs_review
Priority: major | Milestone: sage-4.3.2
Component: symbolics | Keywords:
Author: Burcin Erocal | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
-----------------------------+----------------------------------------------
Comment(by schilly):
I asked the reporter of the bug, and he found yet another problem. I think
it's still related:
For me the patch fixes the problem only partially.
things like
{{{var('X'); f(x)=1/pi/x; fast_callable(f)(x)}}}
do now work as expected, but
{{{var('X'); f(x)=1/pi/x; plot(f,2,3)}}}
still fails -- now with a different error:
{{{
---------------------------------------------------------------------------
AttributeError Traceback (most recent call
last)
/usr/local/sage-mathe/sage-4.3.1-linux-openSUSE_11.1_x86_64-x86_64-
Linux/<ipython console> in <module>()
/usr/local/sage-mathe/sage-4.3.1-linux-openSUSE_11.1_x86_64-x86_64-
Linux/local/lib/python2.6/site-packages/sage/plot/misc.pyc in
wrapper(*args,
**kwds)
241 kwds[new_name] = kwds[old_name]
242 del kwds[old_name]
--> 243 return func(*args, **kwds)
244
245 from sage.misc.sageinspect import sage_getsource
/usr/local/sage-mathe/sage-4.3.1-linux-openSUSE_11.1_x86_64-x86_64-
Linux/local/lib/python2.6/site-packages/sage/plot/misc.pyc in
wrapper(*args,
**kwds)
136 options['__original_opts'] = kwds
137 options.update(kwds)
--> 138 return func(*args, **options)
139
140
/usr/local/sage-mathe/sage-4.3.1-linux-openSUSE_11.1_x86_64-x86_64-
Linux/local/lib/python2.6/site-packages/sage/plot/plot.pyc in plot(funcs,
*args, **kwds)
2463
2464 if hasattr(funcs, 'plot'):
-> 2465 G = funcs.plot(*args, **original_opts)
2466 # if we are using the generic plotting method
2467 else:
/usr/local/sage-mathe/sage-4.3.1-linux-openSUSE_11.1_x86_64-x86_64-
Linux/local/lib/python2.6/site-packages/sage/symbolic/expression.so in
sage.symbolic.expression.Expression.plot
(sage/symbolic/expression.cpp:25582)
()
/usr/local/sage-mathe/sage-4.3.1-linux-openSUSE_11.1_x86_64-x86_64-
Linux/local/lib/python2.6/site-packages/sage/symbolic/expression.so in
sage.symbolic.expression.Expression._plot_fast_callable
(sage/symbolic/expression.cpp:26014)()
/usr/local/sage-mathe/sage-4.3.1-linux-openSUSE_11.1_x86_64-x86_64-
Linux/local/lib/python2.6/site-packages/sage/symbolic/expression.so in
sage.symbolic.expression.Expression._fast_float_
(sage/symbolic/expression.cpp:25025)()
/usr/local/sage-mathe/sage-4.3.1-linux-openSUSE_11.1_x86_64-x86_64-
Linux/local/lib/python2.6/site-
packages/sage/symbolic/expression_conversions.py in fast_float(ex, *vars)
1199 1.4142135623730951
1200 """
-> 1201 return FastFloatConverter(ex, *vars)()
1202
1203 #################
/usr/local/sage-mathe/sage-4.3.1-linux-openSUSE_11.1_x86_64-x86_64-
Linux/local/lib/python2.6/site-
packages/sage/symbolic/expression_conversions.py in __call__(self, ex)
211 if getattr(self, 'use_fake_div', False) and operator is
_operator.mul:
212 div = self.get_fake_div(ex)
--> 213 return self.arithmetic(div, div.operator())
214 return self.arithmetic(ex, operator)
215 elif operator in relation_operators:
/usr/local/sage-mathe/sage-4.3.1-linux-openSUSE_11.1_x86_64-x86_64-
Linux/local/lib/python2.6/site-
packages/sage/symbolic/expression_conversions.py in arithmetic(self, ex,
operator)
1150 from sage.functions.all import sqrt
1151 return sqrt(self(operands[0]))
-> 1152 fops = map(self, operands)
1153 return reduce(operator, fops)
1154
/usr/local/sage-mathe/sage-4.3.1-linux-openSUSE_11.1_x86_64-x86_64-
Linux/local/lib/python2.6/site-
packages/sage/symbolic/expression_conversions.py in __call__(self, ex)
198
199 try:
--> 200 obj = ex.pyobject()
201 return self.pyobject(ex, obj)
202 except TypeError, err:
AttributeError: 'sage.rings.integer.Integer' object has no attribute
'pyobject'
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8056#comment:2>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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