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Re: Setting up equations (Revision)


My first response had some unnecessary steps.

eqn=5 x+6 y+7 z==a x+b y+c z;

Solve[(Flatten[CoefficientList[#,{x,y,z}]]&/@
       eqn),{a,b,c}]

{{a -> 5, b -> 6, c -> 7}}


Bob Hanlon
hanlonr at cox.net



On Apr 26, 2006, at 7:35 AM, Bob Hanlon wrote:

> eqn=5 x+6 y+7 z==a x+b y+c z;
>
> Solve[Equal@@
>     (Flatten[CoefficientList[#,{x,y,z}]]&/@
>         List@@eqn),{a,b,c}]
>
> {{a -> 5, b -> 6, c -> 7}}
>
>
> Bob Hanlon
> hanlonr at cox.net
>
>
>
> On Apr 26, 2006, at 4:37 AM, Yaroslav Bulatov wrote:
>
>> I'm trying to do things of the form
>> Solve[5 x + 6 y + 7 z == a x + b y + c z, {a, b, c}]
>>
>> But since x,y,z are variables, what I really mean is
>> Solve[5==a && 6==b && 7==c], so I need to convert to this form
>>
>> If I only have one variable, the following does what I need
>>
>> LogicalExpand[a*x + b*x^2 + O[x]^3 == 2*x + 3*x^2 + O[x]^3]
>>
>> But what to do if I have several variables?
>>
>


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