Hi,
durings some work on the unification of linestyle options I found the
following little bug:
var('y')
plot_vector_field((sin(x), cos(y)), (x,-3,3), (y,-3,3),linestyle='dotted')
crashes with a "maximum recursion depth" error.
One would however expect that it prints out a warning, that the linestyle
option is ignored, togehter with a lis of the allowed options.
The reason for this problem is simple: .options() checks whether there are
unknown options and if this is the case prints a warning. While printing
this it calls ._repr_. Unfortunately in .plot_field.py the function
._repr_() calls options again which reates the infinite loop:
def _repr_(self):
"""
String representation of PlotField graphics primitive.
EXAMPLES::
sage: x,y = var('x,y')
sage: P=plot_vector_field((sin(x), cos(y)), (x,-3,3), (y,-3,3))
sage: P[0]
PlotField defined by a 20 x 20 vector grid
"""
return "PlotField defined by a %s x %s vector grid"%(self.options()[
'plot_points'], self.options()['plot_points'])
I would propose openig a ticket and uploading a patch which replaces
self.options()
by
self._options
However being completely unexperienced with fixing bugs in sage I wanted to
mail it to the list first and ask whether some more experienced developpers
see some problems, better solutions or other functions that could be
affacted.
Thanks for your feed-back
Tobi
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