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MathGroup Archive 2003

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Re: RealOnly

  • To: mathgroup at smc.vnet.net
  • Subject: [mg39196] Re: RealOnly
  • From: "Allan Hayes" <hay at haystack.demon.co.uk>
  • Date: Mon, 3 Feb 2003 01:09:47 -0500 (EST)
  • References: <b1idka$bk3$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

"Ray" <rayfg at optonline.net> wrote in message
news:b1idka$bk3$1 at smc.vnet.net...
> If I activate <<Miscellaneous`RealOnly` to do a calculation where I only
> want real values, how can I get rid of it so I can do a different
> calculation involving complex values. In other words, how do I close the
> RealOnly function. Is there another way of doing a calculation that will
> work only in the reals without opening RealOnly. Thanks.
>

Ray,
Here is a modification of a posting by Bob Hanlon in Sept 2000.


    RealOnly /: On[RealOnly] :=
        Needs[ "Miscellaneous`RealOnly`"];

    RealOnly /: Off[RealOnly] :=
       (Unprotect[Power, Solve, Roots]; Clear[Power, Solve,
         Roots]; Protect[Power, Solve, Roots];
        Remove["Miscellaneous`RealOnly`Nonreal"]; $Post =. )

Check

    (-1.)^(1/3)

        0.5 + 0.8660254037844387*I

    On[RealOnly]
    (-1.)^(1/3)

        -1.

    Off[RealOnly]
    (-1.)^(1/3)

        0.5 + 0.8660254037844387*I


--
Allan

---------------------
Allan Hayes
Mathematica Training and Consulting
Leicester UK
hay at haystack.demon.co.uk
Voice: +44 (0)116 271 4198
Fax: +44 (0)870 164 0565





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