Sha256: 12b192527c37e5613d9063de1c2dc3067f583396e4b4d9fe22a333d96128a2c2
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Size: 698 Bytes
Versions: 10
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Contents
module Dydx
module Algebra
class Inverse
include Helper
attr_accessor :x, :operator
def initialize(x, operator)
@x, @operator = x, operator
end
def to_s
# sym = {'*'=>'/', '+'=>'-'}[operator.to_s]
case operator
when :+
"( - #{x} )"
when :*
"( 1 / #{x} )"
end
end
def differentiate(sym=:x)
case operator
when :+
inverse(x.differentiate(sym), :+)
when :*
inverse(x.differentiate(sym) * inverse(x ^ 2, :*), :+)
end
end
alias_method :d, :differentiate
def ==(x)
to_s == x.to_s
end
end
end
end
Version data entries
10 entries across 10 versions & 1 rubygems