#11753: Fix step=0 in (x)srange
------------------------+---------------------------------------------------
Reporter: ppurka | Owner: jason, was
Type: defect | Status: new
Priority: minor | Milestone: sage-4.7.2
Component: graphics | Keywords: srange xsrange division_by_zero
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
------------------------+---------------------------------------------------
The following command
{{{
plot(x,3,3)
}}}
generates the following error:
{{{
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "_sage_input_4.py", line 10, in <module>
exec compile(u'open("___code___.py","w").write("# -*- coding: utf-8
-*-\\n" +
_support_.preparse_worksheet_cell(base64.b64decode("cGxvdCh4LDMsMyk="),globals())+"\\n");
execfile(os.path.abspath("___code___.py"))
File "", line 1, in <module>
File "/tmp/tmpezK4rJ/___code___.py", line 3, in <module>
exec compile(u'plot(x,_sage_const_3 ,_sage_const_3 )
File "", line 1, in <module>
File "/home/punarbasu/Installations/sage-4.7/local/lib/python2.6/site-
packages/sage/misc/decorators.py", line 573, in wrapper
return func(*args, **kwds)
File "/home/punarbasu/Installations/sage-4.7/local/lib/python2.6/site-
packages/sage/misc/decorators.py", line 432, in wrapper
return func(*args, **options)
File "/home/punarbasu/Installations/sage-4.7/local/lib/python2.6/site-
packages/sage/plot/plot.py", line 3032, in plot
G = funcs.plot(*args, **original_opts)
File "expression.pyx", line 8023, in
sage.symbolic.expression.Expression.plot
(sage/symbolic/expression.cpp:31185)
File "/home/punarbasu/Installations/sage-4.7/local/lib/python2.6/site-
packages/sage/misc/decorators.py", line 573, in wrapper
return func(*args, **kwds)
File "/home/punarbasu/Installations/sage-4.7/local/lib/python2.6/site-
packages/sage/misc/decorators.py", line 432, in wrapper
return func(*args, **options)
File "/home/punarbasu/Installations/sage-4.7/local/lib/python2.6/site-
packages/sage/plot/plot.py", line 3051, in plot
G = _plot(funcs, (xmin, xmax), *args, **kwds)
File "/home/punarbasu/Installations/sage-4.7/local/lib/python2.6/site-
packages/sage/plot/plot.py", line 3154, in _plot
data = generate_plot_points(f, xrange, plot_points,
adaptive_tolerance, adaptive_recursion, randomize)
File "/home/punarbasu/Installations/sage-4.7/local/lib/python2.6/site-
packages/sage/plot/plot.py", line 4154, in generate_plot_points
data = srange(*ranges[0], include_endpoint=True)
File "/home/punarbasu/Installations/sage-4.7/local/lib/python2.6/site-
packages/sage/misc/misc.py", line 1149, in srange
L =
list(xsrange(start,end,step,universe,check,include_endpoint,endpoint_tolerance))
File "/home/punarbasu/Installations/sage-4.7/local/lib/python2.6/site-
packages/sage/misc/misc.py", line 1236, in xsrange
count = (end-start)/step
ZeroDivisionError: float division
}}}
The error seems to be in misc.py. Attached is a patch which simply sets
'''step''' to the default value of 1 if it is found to be 0.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11753>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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