Re: using units with FindRoot
- To: mathgroup at smc.vnet.net
- Subject: [mg124521] Re: using units with FindRoot
- From: Bob Hanlon <hanlonr357 at gmail.com>
- Date: Sun, 22 Jan 2012 07:26:23 -0500 (EST)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
- References: <201201211016.FAA10141@smc.vnet.net>
You can eliminate the units by replacing them with one.
FindRoot[eqns /. Celsius -> 1, ...]
Bob Hanlon
On Sat, Jan 21, 2012 at 5:16 AM, Michelle A <hfvballgurl33 at gmail.com> wrote:
> 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)?
>
- References:
- using units with FindRoot
- From: Michelle A <hfvballgurl33@gmail.com>
- using units with FindRoot