#4465: zero-length errors give division error instead of just drawing a point.
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Reporter: jason | Owner: was
Type: defect | Status: new
Priority: major | Milestone: sage-3.2
Component: graphics | Keywords:
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This is an error to a custom patch that we have to the matplotlib code so
that we can have arrows that are shortened by a certain number of points.
{{{
This week, I was drawing plot vector field using two ways : (1)
plot_vector_field and (2) by simply suming up plenty of arrows as I
wished. Since their was a fixed point somewhere, I came up with the
problem of drawing a zero length arrow. Using sage 3.1.4, I get a zero
division error. Where is this division from? The example below show that
it is not from the slope as it can draw a vertical arrow.
sage: arrow((1, 1), (2, 1))
sage: arrow((1, 1), (1, 2))
sage: arrow((1, 1), (1, 1))
---------------------------------------------------------------------------
ZeroDivisionError Traceback (most recent call
last) :
...
/home/slabbe/sage/local/lib/python2.5/site-
packages/matplotlib/arrow_line.pyc in draw(self, renderer)
100 pixel_vector = (orig_t.transform_point(points[1]) -
orig_t.transform_point(points[0]))
101 pixel_length=math.sqrt(sum(pixel_vector**2))
--> 102 clip_fraction =
renderer.points_to_pixels(self._arrowshorten)/pixel_length
103 head_clip_fraction =
renderer.points_to_pixels(self._arrowshorten+self._arrowheadlength*0.8)/pixel_length
104
ZeroDivisionError: float division
In my problem, I would have been happy if arrow(x,x) would draw simply a
point. I know I can define my own arrow but maybe sage's arrow could
behave like myarrow ?
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4465>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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