The same expression, How can I want to get
the coefficient of x^4*y?
Thank you!
Mike Hansen 写道:
> Hello,
>
> 2009/10/12 <wxu...@sohu.com>:
>
>> Hi, I have another question.
>>
>> I have got the expression,
>>
>> a^2*x^4+b*x^4+c*x+d*y*x^4...(many items)
>>
>> I want to get the coefficient of all the x,x^2,x^3,x^4....
>>
>> here for x^4 is (a^2+b+d*y...)
>>
>> how can I get it?
>>
>
> Something like this:
>
> sage: var('a,b,c,d,x,y')
> (a, b, c, d, x, y)
> sage: ex = a^2*x^4+b*x^4+c*x+d*y*x^4
> sage: ex.coefficient(x^4)
> a^2 + d*y + b
>
> --Mike
>
> >
>
>
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