
Terrible unit trouble in Mathematic 9
Posted:
Dec 23, 2012 7:08 AM


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 unitrelated 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 WA. I've gotten in the habit of starting an inline WA 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 WA 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

