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Re: Quantity
Posted:
Sep 23, 2013 3:43 AM


Am Sonntag, 22. September 2013 08:26:36 UTC+2 schrieb Bill Rowe: > On 9/21/13 at 4:35 AM, kessler.hannes@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 NISTwebsite. In the old Unitspackage (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



