On Thursday, December 8, 2016 at 12:08:21 PM UTC+2, Anastasia Theodouli
wrote:
>
> My Sage version is 6.9
>
> The exact code I use is as follows:
>
> A1 = [(', '.join('x%i'%i for i in [1.. n]))]; ### construct a suitable
> multivariate ring
> V = var(A1[0]) ### define a str variable
> x=vector(list(V)) ### convert to
> vector
> f1=b1-a1.dot_product(x)
>
> fi returns
>
> 25*x1 + 18*x2 + 62
> instead of
> 76*x1 + 83*x2 + 62
>
>
> Thank you!
> Regards,
> Natassa
> On Thursday, December 8, 2016 at 11:49:04 AM UTC+2, Anastasia Theodouli
> wrote:
>>
>> Hi all!
>>
>> In my code, I have a multivariate polynomial with a sign symbol which
>> doesn't return the correct result. I.e.
>>
>> The code snippet is as follows:
>>
>>
>> sage: f1=b1-a1.dot_product(x)
>>
>> a1 is a vector with values (76, 83), b1 is scalar with value 62, x is a
>> vector with values (x1,x2). Thus, f1 should return **62-76 * x1-83 * x2**;
>> however it returns **25*x1 + 18*x2 + 62** which is not correct.
>>
>> Please note that if I use **addition** in f1 as follows:
>>
>>
>> sage: f1=b1+a1.dot_product(x)
>> The result is correct,i.e. 76*x1 + 83*x2 + 62
>>
>> type(f1) is sage.symbolic.expression.Expression
>>
>> What could the problem be? I tried to convert the symbolic expression to
>> multivariate polynomial, but this didn't work either? I also though there
>> might be a problem with the minus symbol in my PC but couldn't solve it
>> this way either.
>>
>> Thank you for your responses!
>> Regards,
>> Natassa
>>
>
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