#6949: add symbolic max and min functions
-----------------------------+----------------------------------------------
Reporter: burcin | Owner: burcin
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-4.4.2
Component: symbolics | Keywords:
Author: Burcin Erocal | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
-----------------------------+----------------------------------------------
Comment(by lfousse):
Thanks for the updated patch. I applied it on top of 4.4. I can verify the
previously reported problem for numerical evaluation works. I have however
a new problem:
{{{
sage: f(x) = max_symbolic(sin(x), cos(x))
sage: N(integral(f, x, 0, 1))
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
/opt/sage-4.4/<ipython console> in <module>()
/opt/sage-4.4/local/lib/python2.6/site-packages/sage/misc/functional.pyc
in numerical_approx(x, prec, digits)
1163 prec = int((digits+1) * 3.32192) + 1
1164 try:
-> 1165 return x.numerical_approx(prec)
1166 except AttributeError:
1167 from sage.rings.complex_double import
is_ComplexDoubleElement
/opt/sage-4.4/local/lib/python2.6/site-
packages/sage/symbolic/expression.so in
sage.symbolic.expression.Expression.n
(sage/symbolic/expression.cpp:16928)()
/opt/sage-4.4/local/lib/python2.6/site-
packages/sage/symbolic/expression.so in
sage.symbolic.expression.Expression._convert
(sage/symbolic/expression.cpp:4677)()
/opt/sage-4.4/local/lib/python2.6/site-packages/sage/functions/min_max.pyc
in _evalf_(self, *args, **kwds)
155 TypeError: cannot evaluate symbolic expression
numerically
156 """
--> 157 return max_symbolic(args)
158
159 max_symbolic = MaxSymbolic()
/opt/sage-4.4/local/lib/python2.6/site-packages/sage/functions/min_max.pyc
in __call__(self, *args, **kwds)
79 return args
80
---> 81 return BuiltinFunction.__call__(self, *args, **kwds)
82
83 class MaxSymbolic(MinMax_base):
/opt/sage-4.4/local/lib/python2.6/site-packages/sage/symbolic/function.so
in sage.symbolic.function.Function.__call__
(sage/symbolic/function.cpp:4359)()
/opt/sage-4.4/local/lib/python2.6/site-packages/sage/functions/min_max.pyc
in _eval_(self, *args)
136 ValueError: number of arguments must be > 0
137 """
--> 138 return self.eval_helper(max_symbolic, builtin_max, None,
args)
139
140 def _evalf_(self, *args, **kwds):
/opt/sage-4.4/local/lib/python2.6/site-packages/sage/functions/min_max.pyc
in eval_helper(self, this_f, builtin_f, initial_val, args)
51
52 symb_args.append(res)
---> 53 return this_f(*symb_args)
54
55 def __call__(self, *args, **kwds):
/opt/sage-4.4/local/lib/python2.6/site-packages/sage/functions/min_max.pyc
in __call__(self, *args, **kwds)
79 return args
80
---> 81 return BuiltinFunction.__call__(self, *args, **kwds)
82
83 class MaxSymbolic(MinMax_base):
/opt/sage-4.4/local/lib/python2.6/site-packages/sage/symbolic/function.so
in sage.symbolic.function.Function.__call__
(sage/symbolic/function.cpp:4192)()
TypeError: cannot coerce arguments: no canonical coercion from <type
'NoneType'> to Symbolic Ring
}}}
I don't know if the problem is with integrate or max_symbolic.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6949#comment:7>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/sage-trac?hl=en.
