#13246: Automatic exclusion of non-domain points in things like arcsec
-----------------------------------------+--------------------------
Reporter: kcrisman | Owner: jason, was
Type: defect | Status: needs_work
Priority: major | Milestone: sage-6.3
Component: graphics | Resolution:
Keywords: | Merged in:
Authors: Punarbasu Purkayastha | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
-----------------------------------------+--------------------------
Comment (by ppurka):
The error about complex entries was introduced in between 5.10.rc1 and
5.11.rc1
Earlier it used to be a `ValueError` and was properly handled by the plot
code:
{{{
sage: from sage.plot.misc import setup_for_eval_on_grid
sage: f, d = setup_for_eval_on_grid(arcsec, [(-2, 2)])
sage: xi = -0.992725195401
sage: f(xi)
---------------------------------------------------------------------------
ValueError Traceback (most recent call
last)
<ipython-input-4-f7215b663c19> in <module>()
----> 1 f(xi)
/usr/local/src/sage/sage-5.10.rc1.server/local/lib/python2.7/site-
packages/sage/ext/interpreters/wrapper_rdf.so in
sage.ext.interpreters.wrapper_rdf.Wrapper_rdf.__call__
(build/cythonized/sage/ext/interpreters/wrapper_rdf.c:1641)()
/usr/local/src/sage/sage-5.10.rc1.server/local/lib/python2.7/site-
packages/sage/symbolic/expression.so in
sage.symbolic.expression.Expression.__float__
(build/cythonized/sage/symbolic/expression.cpp:7218)()
/usr/local/src/sage/sage-5.10.rc1.server/local/lib/python2.7/site-
packages/sage/symbolic/expression.so in
sage.symbolic.expression.Expression._eval_self
(build/cythonized/sage/symbolic/expression.cpp:6246)()
/usr/local/src/sage/sage-5.10.rc1.server/local/lib/python2.7/site-
packages/sage/functions/trig.pyc in _evalf_(self, x, parent)
731 """
732 if parent is float:
--> 733 return math.acos(1/x)
734 return (1/x).arccos()
735
ValueError: math domain error
}}}
Now it spits out `AttributeError` instead.
{{{
sage: from sage.plot.misc import setup_for_eval_on_grid
sage: f, d = setup_for_eval_on_grid(arcsec, [(-2, 2)])
sage: xi = -0.992725195401
sage: f(xi)
---------------------------------------------------------------------------
AttributeError Traceback (most recent call
last)
<ipython-input-4-f7215b663c19> in <module>()
----> 1 f(xi)
/usr/local/src/sage/sage-5.11.rc0/local/lib/python2.7/site-
packages/sage/ext/interpreters/wrapper_rdf.so in
sage.ext.interpreters.wrapper_rdf.Wrapper_rdf.__call__
(sage/ext/interpreters/wrapper_rdf.c:1641)()
/usr/local/src/sage/sage-5.11.rc0/local/lib/python2.7/site-
packages/sage/symbolic/function.so in
sage.symbolic.function.BuiltinFunction.__call__
(sage/symbolic/function.cpp:8029)()
/usr/local/src/sage/sage-5.11.rc0/local/lib/python2.7/site-
packages/sage/symbolic/expression.so in
sage.symbolic.expression.Expression.__complex__
(sage/symbolic/expression.cpp:7805)()
/usr/local/src/sage/sage-5.11.rc0/local/lib/python2.7/site-
packages/sage/symbolic/expression.so in
sage.symbolic.expression.Expression._eval_self
(sage/symbolic/expression.cpp:6696)()
/usr/local/src/sage/sage-5.11.rc0/local/lib/python2.7/site-
packages/sage/functions/trig.pyc in _evalf_(self, x, parent)
732 if parent is float:
733 return math.acos(1/x)
--> 734 return (1/x).arccos()
735
736 def _eval_numpy_(self, x):
AttributeError: 'complex' object has no attribute 'arccos'
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/13246#comment:27>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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