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Re: Incompatible units?

• To: mathgroup at smc.vnet.net
• Subject: [mg97782] Re: Incompatible units?
• From: David Bailey <dave at removedbailey.co.uk>
• Date: Sat, 21 Mar 2009 05:19:29 -0500 (EST)
• References: <gpvhet$h05$1@smc.vnet.net>

Mathias Lindner wrote:
> Hi
> 
> Today I struggled with the units package - again...
> 
> Let me show you what I did:
> 
>     Dynamic[Subscript[\[Tau], p]]
>     Subscript[l, case]
>     \[Lambda] = \Convert[Subscript[l, case]/Dynamic[Subscript[\[Tau], p]], 1]
> 
> This input results in:
> 
>     27.4889 Meter Milli
>     281 Meter Milli
> 
>     Convert::incomp : Incompatible units in (281 Meter Milli)/(27.4889 Meter Milli) and 1.
>     (281 Meter Milli)/(27.4889 Meter Milli)
> 
> If I don't use dynamic but constant tau_p everything is fine...
> So Mathematica isn't able to to reduce this fraction? What's the reason for this behaviour and what can I do about it?
> 
> Thanks for your help!
> 
> Mathias
> 
Your code is still obviously incomplete - for example, the number 
27.4889 must come from something. Give us some complete code, and try to 
explain what you are trying to do with the Dynamic.

David Bailey
http://www.dbaileyconsultancy.co.uk