lockfile and start of rubocop

.rubocop.yml

@@ -0,0 +1 @@
+inherit_from: ./.rubocop_todo.yml

.rubocop_todo.yml

@@ -0,0 +1,27 @@
+# This configuration was generated by
+# `rubocop --auto-gen-config`
+# on 2016-02-02 13:47:03 -0800 using RuboCop version 0.36.0.
+# The point is for the user to remove these configuration records
+# one by one as the offenses are removed from the code base.
+# Note that changes in the inspected code, or installation of new
+# versions of RuboCop, may require this file to be generated again.
+
+# Offense count: 2
+Metrics/AbcSize:
+  Max: 87
+
+# Offense count: 8
+# Configuration parameters: AllowHeredoc, AllowURI, URISchemes.
+# URISchemes: http, https
+Metrics/LineLength:
+  Max: 109
+
+# Offense count: 2
+# Configuration parameters: CountComments.
+Metrics/MethodLength:
+  Max: 26
+
+# Offense count: 2
+# Configuration parameters: CountKeywordArgs.
+Metrics/ParameterLists:
+  Max: 9

.ruby-gemset

@@ -0,0 +1 @@
+holtwinters

.ruby-version

@@ -0,0 +1 @@
+2.3.0

Gemfile

@@ -1,3 +1,3 @@
 # -*- mode: ruby; -*-
-source :rubygems
+source 'https://rubygems.org'
 gemspec

Gemfile.lock

@@ -0,0 +1,39 @@
+PATH
+  remote: .
+  specs:
+    holt_winters (0.0.0)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    ast (2.2.0)
+    diff-lcs (1.1.3)
+    parser (2.3.0.2)
+      ast (~> 2.2)
+    powerpack (0.1.1)
+    rainbow (2.1.0)
+    rspec (2.6.0)
+      rspec-core (~> 2.6.0)
+      rspec-expectations (~> 2.6.0)
+      rspec-mocks (~> 2.6.0)
+    rspec-core (2.6.4)
+    rspec-expectations (2.6.0)
+      diff-lcs (~> 1.1.2)
+    rspec-mocks (2.6.0)
+    rubocop (0.36.0)
+      parser (>= 2.3.0.0, < 3.0)
+      powerpack (~> 0.1)
+      rainbow (>= 1.99.1, < 3.0)
+      ruby-progressbar (~> 1.7)
+    ruby-progressbar (1.7.5)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  holt_winters!
+  rspec (~> 2.6.0)
+  rubocop
+
+BUNDLED WITH
+   1.11.2

holt_winters.gemspec

@@ -1,22 +1,23 @@
 # -*- mode: ruby; encoding: utf-8 -*-
-$:.push File.expand_path("../lib", __FILE__)
-require "holt_winters/version"
+$LOAD_PATH.push File.expand_path('../lib', __FILE__)
+require 'holt_winters/version'
 
 Gem::Specification.new do |s|
-  s.name        = "holt_winters"
+  s.name        = 'holt_winters'
   s.version     = HoltWinters::VERSION
   s.platform    = Gem::Platform::RUBY
-  s.authors     = ["Brandon Keene"]
-  s.email       = ["[email protected]"]
-  s.homepage    = ""
-  s.summary     = %q{Holt-Winters Triple Exponential Smoothing}
+  s.authors     = ['Brandon Keene']
+  s.email       = ['[email protected]']
+  s.homepage    = ''
+  s.summary     = 'Holt-Winters Triple Exponential Smoothing'
 
-  s.rubyforge_project = "holt_winters"
+  s.rubyforge_project = 'holt_winters'
 
   s.files         = `git ls-files`.split("\n")
   s.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
-  s.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
-  s.require_paths = ["lib"]
+  s.executables   = `git ls-files -- bin/*`.split("\n").map { |f| File.basename(f) }
+  s.require_paths = ['lib']
 
-  s.add_development_dependency "rspec", "~> 2.6.0"
+  s.add_development_dependency 'rspec', '~> 2.6.0'
+  s.add_development_dependency 'rubocop'
 end

lib/holt_winters.rb

@@ -40,7 +40,7 @@ def forecast(y, alpha, beta, gamma, period, m)
 
       seasonal = seasonal_indicies(y, period, seasons)
 
-      holt_winters(y, a0, b0, alpha, beta, gamma, seasonal, period, m);
+      holt_winters(y, a0, b0, alpha, beta, gamma, seasonal, period, m)
     end
 
     def holt_winters(y, a0, b0, alpha, beta, gamma, seasonal, period, m)
@@ -61,8 +61,10 @@ def holt_winters(y, a0, b0, alpha, beta, gamma, seasonal, period, m)
 
       (2..(y.size - 1)).each do |i|
         # Calculate overall smoothing
+        # rubocop:disable all
         if (i - period) >= 0
-         st[i] = alpha * y[i] / it[i - period] + (1.0 - alpha) * (st[i - 1] + bt[i - 1])
+        # rubocop:enable all
+          st[i] = alpha * y[i] / it[i - period] + (1.0 - alpha) * (st[i - 1] + bt[i - 1])
         else
           st[i] = alpha * y[i] + (1.0 - alpha) * (st[i - 1] + bt[i - 1])
         end
@@ -86,11 +88,10 @@ def holt_winters(y, a0, b0, alpha, beta, gamma, seasonal, period, m)
 
     # See: http://robjhyndman.com/researchtips/hw-initialization/
     # 1st period's average can be taken. But y[0] works better.
-    def initial_level(y, period)
+    def initial_level(y, _period)
       y.first
     end
 
-
     # See: http://www.itl.nist.gov/div898/handbook/pmc/section4/pmc435.htm
     def initial_trend(y, period)
       sum = 0
@@ -102,7 +103,6 @@ def initial_trend(y, period)
       sum / (period * period)
     end
 
-
     # See: http://www.itl.nist.gov/div898/handbook/pmc/section4/pmc435.htm
     def seasonal_indicies(y, period, seasons)
       seasonal_average = Array.new(seasons, 0.0)

lib/holt_winters/version.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module HoltWinters
-  VERSION = "0.0.0"
+  VERSION = '0.0.0'.freeze
 end