lib/dydx/integrand.rb in dydx-0.1.314 vs lib/dydx/integrand.rb in dydx-0.1.412

@@ -1,8 +1,9 @@
 module Dydx
   class Integrand
     attr_accessor :function, :var
+
     def initialize(function, var)
       @function = function
       @var = var
     end
 
@@ -10,24 +11,24 @@
       # HOT FIX: should implement Infinity class
       a = - 1000 if a == - Float::INFINITY
       b = 1000 if b == Float::INFINITY
 
       a, b = [a, b].map(&:to_f)
-      raise ArgumentError, 'b should be greater than a' if a > b
-      $int_f = function
+      fail ArgumentError, 'b should be greater than a' if a > b
+      $temp_cal_f = function
 
       n = [n, (b - a) * 2].max
       n += 1 if n.to_i.odd?
       h = (b - a) / n
-      x = ->(i){ a + h * i }
+      x = ->(i) { a + h * i }
 
-      odd_sum = (1..n - 1).to_a.select(&:odd?).inject(0) { |sum, i| sum += f(x.(i))}
-      even_sum = (1..n - 1).to_a.select(&:even?).inject(0) { |sum, i| sum += f(x.(i))}
+      odd_sum = (1..n - 1).to_a.select(&:odd?).inject(0) { |sum, i| sum += f(x.(i)) }
+      even_sum = (1..n - 1).to_a.select(&:even?).inject(0) { |sum, i| sum += f(x.(i)) }
       round_8( (h / 3) * (f(a) + f(b) + 2 * even_sum + 4 * odd_sum) )
     end
 
     def f(vars)
-      int_f(vars)
+      temp_cal_f(vars)
     end
 
     def round_8(num)
       return num if num.abs == Float::INFINITY
       (num * 10 ** 8).round * 10.0 ** (-8)