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Re: issues with unit package

  • To: mathgroup at smc.vnet.net
  • Subject: [mg88644] Re: issues with unit package
  • From: Bill Rowe <readnews at sbcglobal.net>
  • Date: Sun, 11 May 2008 15:13:57 -0400 (EDT)

On 5/10/08 at 6:54 AM, omaha8master at yahoo.com (Jay Ortiz) wrote:

>Why won't Mathematica when using the Units package eliminate
>reciprocal units?   Consider an example from E&M, finding the
>wavelength corresponding to a frequency:

><<Units` <<PhysicalConstants`

>In[1]:=
>Freq=100*^6 Hertz; Wavelength=SpeedOfLight/Freq
>Out[1]=(149896229*Meter)/(50000000*Hertz*Second)
>In[2]:=N[Wavelength] Out[2]=(0.299792*Meter)/(Hertz*Second)

>i.e. Mathematica doesn't know that Meter/(Hertz Second) should
>reduce to Meter.   Shouldn't this be handled?

This can be handled as follows:

In[4]:= (149896229*Meter)/(50000000*Hertz*
     Second) /. Units`Private`$ToFundamental

Out[4]= (149896229 Meter)/50000000


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