class Xirr::NewtonMethod
Class to calculate IRR using Newton Method
Public Instance Methods
xirr(guess, options)
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Calculates XIRR using Newton method @return [BigDecimal] @param guess [Float]
# File lib/xirr/newton_method.rb, line 47 def xirr guess, options func = Function.new(self, :xnpv) rate = [guess || cf.irr_guess] begin nlsolve(func, rate) (rate[0] <= -1 || rate[0].nan?) ? nil : rate[0].round(Xirr::PRECISION) # rate[0].round(Xirr::PRECISION) rescue nil end end