Robert Bradshaw 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
Gee, Bob, we're falling all over ourselves trying to rush to help you!
Welcome again to the community.
Jason
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