using units with FindRoot

*To*: mathgroup at smc.vnet.net*Subject*: [mg124485] using units with FindRoot*From*: Michelle A <hfvballgurl33 at gmail.com>*Date*: Sat, 21 Jan 2012 05:16:57 -0500 (EST)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com

Is there a way to use FindRoot with units? I'm solving the radiation equation with a Temp^4. Solve takes too long/doesn't finish the system of equations solution. It gives the error that {T,10Celsius} is not a number or array of numbers. I have 4 equations and 4 unknowns. The first 3 equations are linear the last one is in the form: sigma((Troof+273Celsius)^4-(Tattic +273Celsius)^4)/R==Q (This isn't the whole equation, just a simplified form of it) Troof, Tattic, and Q are 3 of my unknowns. Is the only way to resolve this to divide by the units for each parameter (ex. Troof/Celsius+273)?

**Follow-Ups**:**Re: using units with FindRoot***From:*Bob Hanlon <hanlonr357@gmail.com>