#15219: numerical integral needs an operand for callable symbolic functions
----------------------------+-------------------------
Reporter: kcrisman | Owner:
Type: defect | Status: new
Priority: minor | Milestone: sage-5.12
Component: calculus | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
----------------------------+-------------------------
Old description:
> I feel like I've seen this before, so close if appropriate...
>
> {{{
>
> sage: h(x) = x
> sage: numerical_integral(h, 1, 2)
> ---------------------------------------------------------------------------
> /Users/.../sage-5.11.rc0/local/lib/python2.7/site-
> packages/sage/symbolic/expression_conversions.pyc in fast_float(ex,
> *vars)
> 1264 1.4142135623730951
> 1265 """
> -> 1266 return FastFloatConverter(ex, *vars)()
> 1267
> 1268 #################
>
> /Users/.../sage-5.11.rc0/local/lib/python2.7/site-
> packages/sage/symbolic/expression_conversions.pyc in __call__(self, ex)
> 206 operator = ex.operator()
> 207 if operator is None:
> --> 208 return self.symbol(ex)
> 209
> 210 if operator in arithmetic_operators:
>
> /Users/.../sage-5.11.rc0/local/lib/python2.7/site-
> packages/sage/symbolic/expression_conversions.pyc in symbol(self, ex)
> 1182 return self.ff.fast_float_constant(float(ex))
> 1183 except TypeError:
> -> 1184 raise ValueError, "free variable: %s" % repr(ex)
> 1185
> 1186 def arithmetic(self, ex, operator):
>
> ValueError: free variable: x |--> x
> }}}
> but
> {{{
> sage: numerical_integral(x, 1, 2)
> (1.5, 1.6653345369377348e-14)
> }}}
> I think this should be easy to fix by catching this somehow.
New description:
I feel like I've seen this before, so close if appropriate... See
[http://ask.sagemath.org/question/3029/numerical_integral-throwing-an-
error this ask.sagemath question].
{{{
sage: h(x) = x
sage: numerical_integral(h, 1, 2)
---------------------------------------------------------------------------
/Users/.../sage-5.11.rc0/local/lib/python2.7/site-
packages/sage/symbolic/expression_conversions.pyc in fast_float(ex, *vars)
1264 1.4142135623730951
1265 """
-> 1266 return FastFloatConverter(ex, *vars)()
1267
1268 #################
/Users/.../sage-5.11.rc0/local/lib/python2.7/site-
packages/sage/symbolic/expression_conversions.pyc in __call__(self, ex)
206 operator = ex.operator()
207 if operator is None:
--> 208 return self.symbol(ex)
209
210 if operator in arithmetic_operators:
/Users/.../sage-5.11.rc0/local/lib/python2.7/site-
packages/sage/symbolic/expression_conversions.pyc in symbol(self, ex)
1182 return self.ff.fast_float_constant(float(ex))
1183 except TypeError:
-> 1184 raise ValueError, "free variable: %s" % repr(ex)
1185
1186 def arithmetic(self, ex, operator):
ValueError: free variable: x |--> x
}}}
but
{{{
sage: numerical_integral(x, 1, 2)
(1.5, 1.6653345369377348e-14)
}}}
I think this should be easy to fix by catching this somehow.
--
Comment (by kcrisman):
{{{
$ hg log -r 12287
changeset: 12287:d7533ae4895e
user: Mike Hansen <[email protected]>
date: Tue May 19 16:11:30 2009 -0700
summary: Updates for Pynac-0.1.7, main symbolics switch (#5930)
}}}
So apparently it's been here for a while.
--
Ticket URL: <http://trac.sagemath.org/ticket/15219#comment:2>
Sage <http://www.sagemath.org>
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