[Date Index]
[Thread Index]
[Author Index]
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)?
>
Prev by Date:
**Re: select 1st column element based on criteria in 2nd AND 3rd column**
Next by Date:
**Re: select 1st column element based on criteria in 2nd AND 3rd column**
Previous by thread:
**using units with FindRoot**
Next by thread:
**Region Plot with more than two functions**
| |