The callable symbolic function is a red herring. The problem arises
when solving one equation for one variable and using
solution_dict=True (see below).
Alex
----------------------------------------------------------------------
| Sage Version 3.4.1, Release Date: 2009-04-21
|
| Type notebook() for the GUI, and license() for information.
|
----------------------------------------------------------------------
sage: solve([],x)
[]
sage: solve([],x,solution_dict=True)
[]
sage: solve([x==0],x)
[x == 0]
sage: solve([x==0],x,solution_dict=True)
---------------------------------------------------------------------------
AttributeError Traceback (most recent call
last)
/Users/arai021/<ipython console> in <module>()
/Applications/sage/local/lib/python2.5/site-packages/sage/calculus/
equations.pyc in solve(f, *args, **kwds)
1588 sol_list = string_to_list_of_solutions(a)
1589 if 'solution_dict' in kwds and kwds['solution_dict']
==True:
-> 1590 sol_dict=[dict([[eq.left(),eq.right()] for eq in
solution]) for solution in sol_list]
1591 return sol_dict
1592 else:
AttributeError: 'SymbolicVariable' object has no attribute 'left'
sage: solve([x==0,x==x],x)
[[x == 0]]
sage: solve([x==0,x==x],x,solution_dict=True)
[{x: 0}] # Interesting
On May 7, 1:34 pm, Alex Raichev <[email protected]> wrote:
> Hi all:
>
> Is this a bug in solve()?
>
> Alex
>
> ----------------------------------------------------------------------
> | Sage Version 3.4.1, Release Date: 2009-04-21 |
> | Type notebook() for the GUI, and license() for information. |
> ----------------------------------------------------------------------
> sage: f= function('f',x)
> sage: solve([f^2==3],[f])
> [f(x) == -sqrt(3), f(x) == sqrt(3)]
> sage: solve([f^2==3],[f],solution_dict=True)
> ---------------------------------------------------------------------------
> AttributeError Traceback (most recent call
> last)
>
> /Users/arai021/.sage/temp/prj_567_106.cs.auckland.ac.nz/978/
> _Users_arai021_afs_sage_work_mgf_sage_3.py in <module>()
>
> /Applications/sage/local/lib/python2.5/site-packages/sage/calculus/
> equations.pyc in solve(f, *args, **kwds)
> 1588 sol_list = string_to_list_of_solutions(a)
> 1589 if 'solution_dict' in kwds and kwds['solution_dict']
> ==True:
> -> 1590 sol_dict=[dict([[eq.left(),eq.right()] for eq in
> solution]) for solution in sol_list]
> 1591 return sol_dict
> 1592 else:
>
> AttributeError: 'SymbolicFunctionEvaluation' object has no attribute
> 'left'
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