class Keisan::Functions::Erf
Public Class Methods
new()
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Calls superclass method
# File lib/keisan/functions/erf.rb, line 4 def initialize super("erf") end
Protected Class Methods
derivative(argument)
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# File lib/keisan/functions/erf.rb, line 10 def self.derivative(argument) 2/Math.sqrt(Math::PI) * AST::Function.new([-argument**2], "exp") end