On Sep 22, 2008, at 6:17 PM, William Stein wrote:
> On Mon, Sep 22, 2008 at 6:12 PM, Robert Bradshaw
> <[EMAIL PROTECTED]> wrote:
>>
>> On Sep 22, 2008, at 6:09 PM, William Stein wrote:
>>
>>>
>>> On Mon, Sep 22, 2008 at 6:04 PM, Jason Grout
>>> <[EMAIL PROTECTED]> wrote:
>>>>
>>>> Bob Wonderly wrote:
>>>>> Using Sage I solved a long list of equations and put the
>>>>> solutions (s)
>>>>> in a list; e.g.:
>>>>>
>>>>> sage: for j in range(52,54,1):
>>>>> q = slst[j]
>>>>> j=q[0]; k=(q[1]); s=(q[2])
>>>>> (q,j,k,s)
>>>>> .....:
>>>>> ([52, 30, 2081203288L], 52, 30, 2081203288L)
>>>>> ([53, 53, 17903198518682712L], 53, 53, 17903198518682712L)
>>>>>
>>>>> Now I want to plug j and s into the list of y equations so that I
>>>>> can do
>>>>> further calculations involving i. But Sage appears to be getting
>>>>> hung on
>>>>> the s being long:
>>>>>
>>>>> sage: for j in range(52,54,1):
>>>>> q = slst[j]
>>>>> j=q[0]; k=(q[1]); s=(q[2])
>>>>> y = 2*(2**k)*i + s
>>>>> (j,k,s,y)
>>>>> .....:
>>>>> ....
>>>>> ....
>>>>> TypeError: unsupported operand parent(s) for '+': 'Symbolic Ring'
>>>>> and
>>>>> '<type 'long'>'
>>>>>
>>>>> When I take the s out of the equation for y it's OK:
>>>>>
>>>>> sage: for j in range(52,54,1):
>>>>> q = slst[j]
>>>>> j=q[0]; k=(q[1]); s=(q[2])
>>>>> y = 2*(2**k)*i
>>>>> (j,k,s,y)
>>>>> .....:
>>>>> (52, 30, 2081203288L, 2147483648*i)
>>>>> (53, 53, 17903198518682712L, 18014398509481984*i)
>>>>>
>>>>> FWIW:
>>>>>
>>>>> sage: type(j), type(k), type(s), type(y), type(i)
>>>>>
>>>>>
>>>>> (<type 'int'>,
>>>>> <type 'int'>,
>>>>> <type 'long'>,
>>>>> <class 'sage.calculus.calculus.SymbolicArithmetic'>,
>>>>> <class 'sage.calculus.calculus.SymbolicVariable'>)
>>>>>
>>>>> None of the tricks I tried have convinced Sage and y that s is OK.
>>>>
>>>>
>>>> Can you try converting s to an element that Sage knows by saying:
>>>>
>>>> y = 2*(2**k)*i + Integer(s)
>>>>
>>>> That said, I reproduced your error with just:
>>>>
>>>> sage: var("b")+long(2)
>>>
>>> This is a bug, so I've added it to trac:
>>>
>>> http://trac.sagemath.org/sage_trac/ticket/4171
>>
>> ... just after I added the ticket here: http://trac.sagemath.org/
>> sage_trac/ticket/4170
>>
>
> What's the rule about whose is a dupe then? I posted on sage-support
> first, but you hit "new ticket" first. I'll let you have the
> ticket; please
> mark mine a dupe.
Yeah, I paused long enough to write a patch. I guess this is a good
kind of problem to have :).
- Robert
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