Re: Get numbers out of PhysicalConstants?
- To: mathgroup at smc.vnet.net
- Subject: [mg62584] Re: [mg62572] Get numbers out of PhysicalConstants?
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Tue, 29 Nov 2005 04:44:17 -0500 (EST)
- Reply-to: hanlonr at cox.net
- Sender: owner-wri-mathgroup at wolfram.com
Needs["Miscellaneous`PhysicalConstants`"];
removeUnits=
Thread[
Union[
Cases[
ToExpression[
Names["Miscellaneous`PhysicalConstants`*"]],
_Symbol?(!NumericQ[#]&),Infinity]]->1];
VacuumPermeability/.removeUnits
Pi/2500000
Bob Hanlon
>
> From: "Wonseok Shin" <wssaca at gmail.com>
To: mathgroup at smc.vnet.net
> Date: 2005/11/28 Mon AM 01:38:15 EST
> Subject: [mg62584] [mg62572] Get numbers out of PhysicalConstants?
>
> Hello,
>
> Is there any way to get numbers out of the constants defined in
> Miscellaneous`PhysicalConstants` package? Carrying units all the time
> is inconvenient in calculation.
>
> For example,
> In[1]:= << Miscellaneous`PhysicalConstants`
> In[2]:= VacuumPermeability
> Out[2]= \!\(\(p\ Second\ Volt\)\/\(2500000\ Ampere\ Meter\)\)
>
> I want to get the number p/2500000 out of VacuumPermeability, without
> units. How can I do this?
>
>