Hello wxuyec,
> The same expression, How can I want to get
>
> the coefficient of x^4*y?
>
The coefficient of the coefficient...
try
var('a b x y')
res = expand ((a+b+x+y+1)^6)
res.coefficient (x^4)
res.coefficient (y)
res.coefficient (x^4).coefficient(y)
res.coefficient (y).coefficient(x^4)
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 :
>
>> 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
Hello,
2009/10/12 :
>
> 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')
