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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>