lib/core/facets/numeric/approx.rb in facets-2.9.2 vs lib/core/facets/numeric/approx.rb in facets-2.9.3

@@ -1,15 +1,38 @@
 class Numeric
 
+  # Determines if another number is approximately equal within a given
+  # _n_th degree. Defaults to 100ths if the degree is not specified.
+  #
+  # Currently defaults to 1/10,000,000 if the degree is not specified.
+  # But this may change once a "most commonly useful" factor is determined.
+  #
+  # This is the same a {#close?} but has a different defualt.
+  #
+  # @author Gavin Sinclair
+
+  def approx?(x, n=0.0000001)
+    close?(x, n)
+  end
+
   # Determines if another number is approximately equal
-  # within a given _n_th degree. Defaults to 100ths
-  # if the degree is not specified.
+  # within a given +epsilon+.
   #
-  # CREDIT: Trans
+  # This is the same a {#approx?} but has a different defualt.
+  #
+  # @author Gavin Sinclair
+  def close?(number, epsilon=0.01)
+    return(self == number) if epsilon.zero?
 
-  def approx?(x, n=0.01)
-    return(self == x) if n == 0
-    (self - x).abs <= n
+    a, b = self.to_f, number.to_f
+    if a.zero? or b.zero?
+      ## There's no scale, so we can only go on difference.
+      (a - b).abs < @epsilon
+    else
+      ## We go by ratio. The ratio of two equal numbers is one, so the ratio
+      ## of two practically-equal floats will be very nearly one.
+      (a/b - 1).abs < epsilon
+    end
   end
 
 end