Re: Solve::ivar: xxx is not a valid variable. >>
- To: mathgroup at smc.vnet.net
- Subject: [mg117226] Re: Solve::ivar: xxx is not a valid variable. >>
- From: Bill Rowe <readnews at sbcglobal.net>
- Date: Sat, 12 Mar 2011 05:07:57 -0500 (EST)
On 3/11/11 at 4:34 AM, mail at maarten.dk (Morten J=C3=B8rgensen) wrote:
>Hi guys, why is it that I get this message
>Solve::ivar: 3777.865080388886` is not a valid variable. >>
>while using numbers from previous calculations (Q, m, C, T2) in this
>equation
>Solve[Q == m * C * (T3 - T2), T3]
That should mean the value 3777.865080388886 is assigned to T3.
Try doing
Clear[T3];
Solve[Q == m * C * (T3 - T2), T3]
or
Block[{T3}, Solve[Q == m * C * (T3 - T2), T3]]