#15052: plot_field crashes if if self.options() is called for an object with an
unknown option
--------------------------------+----------------------------
       Reporter:  twch          |        Owner:
           Type:  defect        |       Status:  needs_review
       Priority:  major         |    Milestone:  sage-5.12
      Component:  graphics      |   Resolution:
       Keywords:                |    Merged in:
        Authors:  Tobias Weich  |    Reviewers:
Report Upstream:  N/A           |  Work issues:
         Branch:                |       Commit:
   Dependencies:                |     Stopgaps:
--------------------------------+----------------------------
Description changed by twch:

Old description:

> Consider the following example:
>
> {{{
> sage: x,y=var('x,y')
> sage: P=plot_vector_field((sin(x), cos(y)), (x,-3,3), (y,-3,3),
> wrong_option='nonsense')
> sage: P[0].options()['plot_points']
> }}}
>
> One would expect that this returns the value of plot_points together with
> a warning that a unknown option is set. Instead it enters an infinite
> loop and crashes

New description:

 Consider the following example:

 {{{
 sage: x,y=var('x,y')
 sage: P=plot_vector_field((sin(x), cos(y)), (x,-3,3), (y,-3,3),
 wrong_option='nonsense')
 sage: P[0].options()['plot_points']
 }}}

 One would expect that this returns the value of plot_points together with
 a warning that a unknown option is set. Instead it enters an infinite loop
 and crashes

 ----

 apply trac_15052_fixes_infinite_loop.patch to devel/sage

--

--
Ticket URL: <http://trac.sagemath.org/ticket/15052#comment:4>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
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