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A RealOnly Package That Can Be Disabled or Enabled
Author

Ted Ersek
Organization: Naval Air Warfare Center, Aircraft Division
URL: http://www.verbeia.com/mathematica/
Old MathSource #

0211-396
Revision date

2004-05-14
Description

RealOnly is a Standard Packages included with Mathematica, and is used to ensure a Negative number to a Rational power is Negative when the exponent is Rational and the Denominator of the exponent is odd. One problem with the RealOnly package is that once the package is loaded restoring the normal Mathematica behavior is cumbersome at best. A package called SwitchableRealOnly is provided which does the same thing as the RealOnly package, and provides a simple method of switching between the normal Mathematica implementation and the RealOnly implementation of (x^y). Another problem with the RealOnly package is that once the package is loaded Roots and Solve incorrectly indicate that some solutions to certain equations are not real. This error is corrected in the SwitchableRealOnly package. The package and a documentation are provided in SwitchableRealOnly.m and SwitchableRealOnlyExamples.nb respectively.
Subjects

*Mathematica Technology > Programming > Equation Solving
*Mathematica Technology > Standard Packages
*Mathematics > Algebra > Polynomials
*Mathematics > Number Theory
Keywords

equation solving, real and complex roots, rational powers
Downloads Download Wolfram CDF Player

Download
SwitchableRealOnly.m (6.4 KB) - Mathematica package [for Mathematica 5.0]
Download
SwitchableRealOnlyTutorial.nb (51.5 KB) - Mathematica notebook [for Mathematica 5.0]