#12238: a bug in taking n() of a definite integral
-------------------------+--------------------------------------------------
Reporter: dimpase | Owner: burcin
Type: defect | Status: closed
Priority: major | Milestone: sage-duplicate/invalid/wontfix
Component: calculus | Resolution: duplicate
Keywords: | Work_issues:
Upstream: N/A | Reviewer: Volker Braun
Author: | Merged:
Dependencies: |
-------------------------+--------------------------------------------------
Changes (by jdemeyer):
* status: positive_review => closed
* resolution: => duplicate
* milestone: sage-4.8 => sage-duplicate/invalid/wontfix
Old description:
> the following triggers a bug in Sage interface, apparently
> {{{
> sage: integrate(sin(x)*(x^(1/2)),x,0,1).n()
> ERROR: An unexpected error occurred while tokenizing input
> The following traceback may be corrupted or invalid
> The error message is: ('EOF in multi-line statement', (1111, 0))
>
> ---------------------------------------------------------------------------
> TypeError Traceback (most recent call
> last)
>
> /usr/local/src/sage/sage-4.8.alpha4/spkg/standard/<ipython console> in
> <module>()
>
> /usr/local/src/sage/sage-4.8.alpha4/local/lib/python2.6/site-
> packages/sage/symbolic/expression.so in
> sage.symbolic.expression.Expression._numerical_approx
> (sage/symbolic/expression.cpp:18004)()
>
> /usr/local/src/sage/sage-4.8.alpha4/local/lib/python2.6/site-
> packages/sage/symbolic/expression.so in
> sage.symbolic.expression.Expression._convert
> (sage/symbolic/expression.cpp:5089)()
>
> /usr/local/src/sage/sage-4.8.alpha4/local/lib/python2.6/site-
> packages/sage/functions/other.pyc in _evalf_(self, x, parent)
> 79 if prec > 53:
> 80 raise NotImplementedError, "erf not implemented for
> precision higher than 53"
> ---> 81 return parent(1 - pari(float(x)).erfc())
> 82
> 83 def _derivative_(self, x, diff_param=None):
>
> /usr/local/src/sage/sage-4.8.alpha4/local/lib/python2.6/site-
> packages/sage/rings/complex_number.so in
> sage.rings.complex_number.ComplexNumber.__float__
> (sage/rings/complex_number.c:7501)()
>
> TypeError: Unable to convert -0.707106781186547 + 0.707106781186547*I to
> float; use abs() or real_part() as desired
> }}}
>
> a comment on IRC:
> {{{
> vbraun: should be return parent(1 - pari(x).erfc())
> vbraun: I guess
> vbraun: or maybe cast to complex
> }}}
New description:
the following triggers a bug in Sage interface, apparently
{{{
sage: integrate(sin(x)*(x^(1/2)),x,0,1).n()
ERROR: An unexpected error occurred while tokenizing input
The following traceback may be corrupted or invalid
The error message is: ('EOF in multi-line statement', (1111, 0))
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
/usr/local/src/sage/sage-4.8.alpha4/spkg/standard/<ipython console> in
<module>()
/usr/local/src/sage/sage-4.8.alpha4/local/lib/python2.6/site-
packages/sage/symbolic/expression.so in
sage.symbolic.expression.Expression._numerical_approx
(sage/symbolic/expression.cpp:18004)()
/usr/local/src/sage/sage-4.8.alpha4/local/lib/python2.6/site-
packages/sage/symbolic/expression.so in
sage.symbolic.expression.Expression._convert
(sage/symbolic/expression.cpp:5089)()
/usr/local/src/sage/sage-4.8.alpha4/local/lib/python2.6/site-
packages/sage/functions/other.pyc in _evalf_(self, x, parent)
79 if prec > 53:
80 raise NotImplementedError, "erf not implemented for
precision higher than 53"
---> 81 return parent(1 - pari(float(x)).erfc())
82
83 def _derivative_(self, x, diff_param=None):
/usr/local/src/sage/sage-4.8.alpha4/local/lib/python2.6/site-
packages/sage/rings/complex_number.so in
sage.rings.complex_number.ComplexNumber.__float__
(sage/rings/complex_number.c:7501)()
TypeError: Unable to convert -0.707106781186547 + 0.707106781186547*I to
float; use abs() or real_part() as desired
}}}
a comment on IRC:
{{{
vbraun: should be return parent(1 - pari(x).erfc())
vbraun: I guess
vbraun: or maybe cast to complex
}}}
See #11948 instead.
--
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12238#comment:4>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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