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MathGroup Archive 2013

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Re: Quantity

  • To: mathgroup at smc.vnet.net
  • Subject: [mg131722] Re: Quantity
  • From: H. Keßler <kessler.hannes at gmail.com>
  • Date: Mon, 23 Sep 2013 22:00:30 -0400 (EDT)
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  • References: <l1m2is$cbe$1@smc.vnet.net>

Am Sonntag, 22. September 2013 08:26:36 UTC+2 schrieb Bill Rowe:
> On 9/21/13 at 4:35 AM, kessler.hannes at gmail.com (H. Ke=C3=9Fler) wrote:
> 
> 
> 
> >But what I am especially looking for is the list of the unit strings
> 
> >in the correct spelling for Mathematica in
> 
> >Quantity[magnitude,unitstring], not only the general overview of
> 
> >units in the NIST-website. In the old Units-package (Mathematica 8
> 
> >and earlier) each unit was a symbol and a list of all units
> 
> >available could be obtained in the correct format and spelling by
> 
> >?Units`*. This is obviously not possible anymore as there is no
> 
> >package and all units are strings.
> 
> 
> 
> There does not seem to be a specific set of unit strings. Note
> 
> that doing:
> 
> 
> 
> In[1]:= UnitConvert[Quantity[12., "Feet"], "Meters"]
> 
> 
> 
> Out[1]= 3.6576 m
> 
> 
> 
> returns a result essentially immediately. But doing
> 
> 
> 
> In[2]:= UnitConvert[Quantity[12., "Foot"], "Meters"]
> 
> 
> 
> Out[2]= 3.6576 m
> 
> 
> 
> returns the same result after a small delay. You should see a
> 
> brief message indicating Mathematica is interpreting the units.
> 
> I believe what is happening here is Mathematica is using Wolfram
> 
> Alpha to interpret the unit string which increases the allowable
> 
> number of unit strings significantly and makes it essentially
> 
> impossible for a user to create a list of allowable unit strings.

Hello Bill,

you are right, Mathematica seems to call Wolfram Alpha. However, I cannot use this feature as the internet connection to Wolfram Alpha is blocked in my company. Therefore I would be interested in a solution which does not rely on Wolfram Alpha.

Best regards, 
Hannes



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