Extended maintenance of Ruby 1.9.3 ended on February 23, 2015. Read more

- mathn.rb

When mathn is required Rational is changed to simplify the use of Rational operations.

Normal behaviour:

Rational.new!(1,3) ** 2 # => Rational(1, 9) (1 / 3) ** 2 # => 0

require ‘mathn’ behaviour:

(1 / 3) ** 2 # => 1/9

**(other)
click to toggle source

Exponentiate by `other`

(1/3) ** 2 # => 1/9

# File mathn.rb, line 138 def ** (other) if other.kind_of?(Rational) other2 = other if self < 0 return Complex(self, 0.0) ** other elsif other == 0 return Rational(1,1) elsif self == 0 return Rational(0,1) elsif self == 1 return Rational(1,1) end npd = numerator.prime_division dpd = denominator.prime_division if other < 0 other = -other npd, dpd = dpd, npd end for elm in npd elm[1] = elm[1] * other if !elm[1].kind_of?(Integer) and elm[1].denominator != 1 return Float(self) ** other2 end elm[1] = elm[1].to_i end for elm in dpd elm[1] = elm[1] * other if !elm[1].kind_of?(Integer) and elm[1].denominator != 1 return Float(self) ** other2 end elm[1] = elm[1].to_i end num = Integer.from_prime_division(npd) den = Integer.from_prime_division(dpd) Rational(num,den) elsif other.kind_of?(Integer) if other > 0 num = numerator ** other den = denominator ** other elsif other < 0 num = denominator ** -other den = numerator ** -other elsif other == 0 num = 1 den = 1 end Rational(num, den) elsif other.kind_of?(Float) Float(self) ** other else x , y = other.coerce(self) x ** y end end

Commenting is here to help enhance the documentation. For example, code samples, or clarification of the documentation.

If you have questions about Ruby or the documentation, please post to one of the Ruby mailing lists. You will get better, faster, help that way.

If you wish to post a correction of the docs, please do so, but also file bug report so that it can be corrected for the next release. Thank you.

If you want to help improve the Ruby documentation, please visit Documenting-ruby.org.