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MathGroup Archive 2004

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Re: Anyone using the Units package extensively?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg45674] Re: Anyone using the Units package extensively?
  • From: bobhanlon at aol.com (Bob Hanlon)
  • Date: Mon, 19 Jan 2004 05:15:18 -0500 (EST)
  • References: <bua34p$img$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Degree is built in to Mathematica

Sin[60 Degree]

Sqrt[3]/2

It will keep exact numbers exact

Sin[37 Degree]

Sin[37*Degree]

N will force numerical evaluation

%//N

0.601815

or you may get some exact numerical results by using FunctionExpand

%%//FunctionExpand // Simplify

(1/2^(1/3))*((1/32 + I/32)*((-(-1 + I*Sqrt[3])^(1/3))*
     (-I + Sqrt[3])*(Sqrt[2]*(-1 + Sqrt[5]) + 
      2*I*Sqrt[5 + Sqrt[5]]) + (-1 - I*Sqrt[3])^(1/3)*
     (I + Sqrt[3])*(I*Sqrt[2]*(-1 + Sqrt[5]) + 
      2*Sqrt[5 + Sqrt[5]])))

%//N // Chop

0.601815


Bob Hanlon

In article <bua34p$img$1 at smc.vnet.net>, AES/newspost <siegman at stanford.edu>
wrote:

<< In article <bu8iv9$au6$1 at smc.vnet.net>, William McHargue <A at B.C> wrote:

> Hello,
> 
> I've been using Mathematica for engineering analysis and have come to
> carry units throughout my calculations. Does anyone else do this and
> would you like to exchange tips/tricks?
> 
> Regards,

Can't say I do this extensively, but I routinely define

    deg = Pi/180.

and then use constructs like

    theta = 37 deg

    Sin[60 deg]

    Print[theta/deg]

to make calculations and results more readable.

Would be glad to hear of other tricks and techniques


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