Re: beginner question regarding units in equations
- To: mathgroup at smc.vnet.net
- Subject: [mg123935] Re: beginner question regarding units in equations
- From: Bill Rowe <readnews at sbcglobal.net>
- Date: Sat, 31 Dec 2011 02:01:23 -0500 (EST)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
On 12/30/11 at 7:09 AM, szhorvat at gmail.com (Szabolcs Horv=C3=A1t) wrote: >On 2011.12.29. 8:53, RDog wrote: >>Many civil engineering equations are empirically derived and >>therefore the units dont work out exactly. How does Mathematica >>handle units in equations and especially in empirical equations >>where there may be parameters set to weird exponetial powers. Does >>the program use units at all in equations or does the user need to >>keep track? >Mathematica does not know about units. It does not keep track of >units by default. So you don't need to worry about units not >matching. >There is the Units` package which provides some limited support for >units, but I have never used it seriously. I think that not using >units explicitly in your program will be the most productive way to >work. There is another package AutomaticUnits available at <http://library.wolfram.com/infocenter/MathSource/7655/> that significantly improves upon the Units package. Along with other things you can do: << AutomaticUnits` radius = r Centimeter; area = Pi r^2; Plot[area, {r, 0, 2}] and get the desired plot without worrying about the units. A much better solution than the Units package.