Re: Terrible unit trouble in Mathematic 9
- To: mathgroup at smc.vnet.net
- Subject: [mg129163] Re: Terrible unit trouble in Mathematic 9
- From: Bill Rowe <readnews at sbcglobal.net>
- Date: Wed, 19 Dec 2012 04:56:15 -0500 (EST)
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- Delivered-to: l-mathgroup@wolfram.com
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On 12/18/12 at 2:39 AM, tio540s1 at gmail.com wrote: >I continue to receive "Unable to interpret unit specification m/s" >(for example, but almost anything I attempt returns this message) >with input: UnitConvert[55 mi/h,"m/s"] or UnitConvert[55 mi/h,m/s] >or any other combination of quotes, omitted quotes, etc. Even the >prediction/suggestion box, when I execute Quantity[55,"mi/hour"}, >after it returns 55 mi/h, if I type in any combination of m/s, >"m"/"s", "m/s", etc. into the box that opens when I select "Convert" >in the prediction box yields the same "unable to interpret unit >specification. >What the heck???? Try In[1]:= speed = Quantity[55, "Miles/Hour"] Out[1]= 55mi/h In[2]:= UnitConvert[speed] // N Out[2]= 24.5872m/s Mathematica ver 9 seems to strongly prefer plural for units. And there is no need to specify target units when converting to standard metric units. Noting In[3]:= FullForm[%] Out[3]//FullForm= Quantity[24.58724917449835`,Times["Meters",Power["Secon= ds",-1]]] it should not be surprising that In[4]:= UnitConvert[speed, "Meters"/"Seconds"] // N Out[4]= 24.5872m/s works.