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require 'nmatrix/nmatrix'

NMatrix.class_eval do

  def row(row_number, get_by = :copy)
    if row_numbers = get_row_or_col_index_array(row_number)
      out = NMatrix.new [row_numbers.length, cols], default_value, dtype: dtype, stype: stype

      row_numbers.each_with_index do |rownum, i|
        out[i, 0..-1] = self[rownum, 0..-1]

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Declared ETags, together with Russian Doll caching, can be used to automatically mix your template and asset versions into the ETags set in your controllers. This avoids the need to blow all browser caches on each deploy and neatly contains the scope of "freshness fallout" when you tweak a view.

To include the template's version in the ETag:

  # Incorporate the cache version for this action into our ETag.
  # This allows template changes to bubble up into HTTP cache
  # freshness and bust browser caches when we make changes.
  etag do
    begin

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// BLEPeripheral: https://github.com/sandeepmistry/arduino-BLEPeripheral
// TimerOne: https://code.google.com/p/arduino-timerone/
#include <TimerOne.h> 
#include <SPI.h>
#include <BLEPeripheral.h>

// Pins used for Adafruit nrf8001 breakout
// See https://learn.adafruit.com/getting-started-with-the-nrf8001-bluefruit-le-breakout/hooking-everything-up
#define BLE_REQ   10
#define BLE_RDY   2

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# Ruby implementation of PCA as described in:
#
#   A tutorial on Principal Components Analysis
#   Lindsay I Smith February 26, 2002
#   http://www.cs.otago.ac.nz/cosc453/student_tutorials/principal_components.pdf
# 
# Install:
#
#   brew install gsl
#   brew install gnuplot --with-x11

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require 'narray' # gem install narray

class LinearRegressor
  attr_reader :theta, :mean, :std, :cost_history
  
  def initialize opts = {}
    @alpha = opts[:alpha] || 0.01
    @iterations = opts[:iterations] || 400
  end

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# Hacks so that CouchRest::Document, which descends from Hash,
# doesn't appear to Rails routing as a Hash of options

class Hash
  def self.===(other)
    return false if other.is_a?(CouchRest::Document)
    super
  end
end
 

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ActionController::Base.class_eval do
  protected
  # BACKPORT OF CHANGE FROM 3.0 EDGE: http://github.com/rails/rails/commit/256b0ee8e3c1610967dfc89f864e24b98ed3c236
  # Returns true or false if a request is verified.  Checks:
  #
  # * is the format restricted?  By default, only HTML requests are checked.
  # * is it a GET request?  Gets should be safe and idempotent
  # * Does the form_authenticity_token match the given token value from the params?
  def self.verified_request?
    !protect_against_forgery?     ||

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# Returns a blank 200 OK response for any form posts that include a value for the honeypot field

module Rack
  class Honeypot

    def initialize(app, field_name)
      @app = app
      @field_name = field_name
    end

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20_000 times

                                    user     system      total        real
Time.parse:                     3.810000   0.020000   3.830000 (  3.870988)
Time.parse_gm:                  0.420000   0.190000   0.610000 (  0.596905)
Time.parse_mktime:              0.520000   0.180000   0.700000 (  0.707689)
Time.parse_maketime:            0.700000   0.190000   0.890000 (  0.899610)
Time.parse_utc:                 0.390000   0.180000   0.570000 (  0.575244)
Time::mktime_with_offset:       0.760000   0.210000   0.970000 (  0.965841)

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require 'date'

class Article < Hash
  def initialize(hsh={})
    replace(hsh)
  end
  
  def ==(other)
    if other.is_a?(Date)
      self[:date] == other