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