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FastVector attributes = new FastVector();
attributes.addElement(numericAttribute);
attributes.addElement(nominalAttribute);
attributes.addElement(stringAttribute);
attributes.addElement(anyOtherAttribute);
attributes.addElement(anotherAttribute);

Instances dataSet = new Instances("dataSetName", attributes, 50);
dataSet.setClassIndex(dataSet.numAttributes() - 1);

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def upload(to_be_uploaded, upload_directory)
  uuid = UUIDTools::UUID.random_create
  uniq_name = "#{uuid}#{to_be_uploaded.original_filename}"
  uploaded_file = File.join(upload_directory, uniq_name)
  File.open(uploaded_file, "w") { |f| f.write(to_be_uploaded.read) }
  uploaded_file
end

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# https://github.com/arsduo/koala/wiki
# https://github.com/arsduo/koala/wiki/Test-Users

# routes.rb
match ‘/auth/failure’, :to => ‘profiles#failure’

# profiles_controller.rb
class ProfilesController < ApplicationController
  def failure
    redirect_to login_url, :flash => {:alert => "Could not log you in. #{params[:message]}"}

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1. Download or clone from https://github.com/quix/linalg
( Assume installation folder is linalg )
2. Install dependencies (Lapack, BLAS and legacy Fortran library header)
$ su
# yum install lapack lapack-devel blas blas-devel gcc-gfortran.i686 compat-gcc-34.i686 compat-gcc-34-g77.i686

3. Locate the Fortran header ( g2c.h )
# updatedb
# locate g2c.h
/usr/lib/gcc/i686-redhat-linux/3.4.6/include/g2c.h

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Flash objects do not obey z-index. This is particularly often found on youtube vids..
To solve this, pass wmode parameter with transparent value... like this: www.youtube.com/embed/somecode?wmode=transparent

$(function() {}); seems to wait for document ready forever, if it's invoked on a popup. Well um.. or probably because the document is already 'ready', the piece of code inside that function won't be even executed.
Instead, put the thing inside that function near the end of </body> tag... please, only if it's a popup. lolplz..

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class Array

  # Largest range with different subsequence,
  # without any kind of clever optimization.
  def range_with_diff_subseq(other)
    self_size = self.size
    other_size = other.size

    low = 0
    max_pos = self_size < other_size ? self_size : other_size

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require "benchmark"
require "rspec"

module RSpec
  module Benchmark
    class Result
      attr_accessor :slowest, :fastest, :average, :elapsed

      def initialize(elapsed)
        @elapsed = elapsed

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require 'benchmark'

MAX = 10_000_000

Benchmark.bm(3) do |b|
  b.report("push") do
    arr = []
    MAX.times {|i| arr.push(i.to_s)}
  end

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class OptionFilter
  def initialize(default_opts)
    @default_opts = default_opts
  end

  def generate(param_name, label_value_pairs)
    @copy = @default_opts.clone
    @current_param = param_name
    label_value_pairs.each { |pair| yield pair[0], opts_for(pair[1]) }
  end

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# rm /var/lib/pgsql/data
# service postgresql initdb
# service postgresql start
# vim /var/lib/pgsql/data/pg_hba.conf
replace ident with trust