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MathGroup Archive 2012

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Terrible unit trouble in Mathematic 9

  • To: mathgroup at smc.vnet.net
  • Subject: [mg129228] Terrible unit trouble in Mathematic 9
  • From: dr DanW <dmaxwarren at gmail.com>
  • Date: Sun, 23 Dec 2012 07:09:15 -0500 (EST)
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Do you have a live Internet connection when evaluating your Quantity expressions? The new units system relies heavily on WolframAlpha for interpretation of units, and many Quantity or other unit-related functions will fail if Mathematica is unable to contact WolframAlpha for help.  This seems to happen mostly when entering Quantities; if the strings representing your units are not immediately recognized by Mathematica, the strings get shipped to W|A.  I've gotten in the habit of starting an inline W|A box, typing my desired quantity, then using Evaluate In Place on the box.  This gives me the quantity in a form that, I believe, will not require W|A next time I evaluate the notebook.  Using InputForm will also let you see the proper naming and spelling of the units for next time.

Daniel



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