mrkn

[2] pry(main)> Pandas = PyCall.import_module('pandas')
/Users/mrkn/src/github.com/mrkn/pycall-next/lib/pycall/init.rb:20: warning: instance variable @handle not initialized
/Users/mrkn/src/github.com/mrkn/pycall-next/lib/pycall/init.rb:26: warning: loading in progress, circular require considered harmful - /Users/mrkn/src/github.com/mrkn/pycall-next/lib/pycall.bundle
        from bin/console:10:in  `<main>'
        from /Users/mrkn/.rbenv/versions/2.4.1-o0/lib/ruby/gems/2.4.0/gems/pry-byebug-3.4.2/lib/pry-byebug/pry_ext.rb:11:in  `start_with_pry_byebug'
        from /Users/mrkn/.rbenv/versions/2.4.1-o0/lib/ruby/gems/2.4.0/gems/pry-0.10.4/lib/pry/pry_class.rb:169:in  `start'
        from /Users/mrkn/.rbenv/versions/2.4.1-o0/lib/ruby/gems/2.4.0/gems/pry-0.10.4/lib/pry/repl.rb:15:in  `start'
        from /Users/mrkn/.rbenv/versions/2.4.1-o0/lib/ruby/gems/2.4.0/gems/pry-0.10.4/lib/pry/repl.rb:38:in  `start'
        from /Users/mrkn/.rbenv/versions/2.4.1-o0/lib/ruby/gems/2.4.0/gems/pry-0.10.4/lib/pry/input_lock.rb

mrkn

require 'pycall/import'

include PyCall::Import

pyimport 'matplotlib.pyplot', as: 'plt'

plt[:plot].([1, 2, 3, 4, 5], 5.times.map { rand })
plt[:show].()

mrkn

class Vocabulary
  def initialize
    @words = []
    @index = {}
  end

  def <<(word)
    unless @index[word]
      @index[word] = @words.length
      @words << word

mrkn

require 'benchmark/ips'

Benchmark.ips do |x|
  rat = 123456789123456789/987654321r
  flt = 123456789.123456789
  fix = 1234567890
  big = 12345678901234567890

  x.report('rat + fix') { rat + fix }
  x.report('rat + big') { rat + big }

mrkn

require 'daru'
require 'tempfile'
require 'open-uri'

def read_as_dataframe(url)
  Tempfile.open('hash_bench') do |tmpfile|
    tmpfile.puts "category\tx\ty"
    open(url) do |io|
      io.each_line do |line|
        next unless line =~ /^TABLE/

mrkn

m = 0
n = 5
10_000_000.times do
  xs = Array.new(n) { 1.0 + 1e-6 * (0.5 - rand) }
  sq_mean = xs.map {|x| x**2 }.sum / n
  mean_sq = (xs.sum / n)**2
  var = sq_mean - mean_sq
  p [m += 1, var] if var.negative?
end

mrkn

$ ./ruby -v -rbenchmark -e 'Benchmark.bmbm() {|x| x.report("even?") { 100_000_000.times { 1.even? } } }
'
ruby 2.4.0dev (2016-03-18 trunk 54163) [x86_64-darwin15]
Rehearsal -----------------------------------------
even?   5.470000   0.020000   5.490000 (  5.525505)
-------------------------------- total: 5.490000sec

            user     system      total        real
even?   5.590000   0.020000   5.610000 (  5.668936)

mrkn

z='ズン';d='ドコ';loop.lazy.map{[z,d].sample.tap{|x|$><<x}}.each_cons(5){|x|break if x.join==z*4+d};puts'キ・ヨ・シ！'

mrkn

from PIL import Image, ImageCms

im = Image.open(image_path)
if im.mode != "RGB":
  im = im.convert("RGB")

srgb_profile = ImageCms.createProfile("sRGB")
lab_profile  = ImageCms.createProfile("LAB")

rgb2lab_transform = ImageCms.buildTransformFromOpenProfiles(srgb_profile, lab_profile, "RGB", "LAB")

mrkn

/*
 * example.c
 *
 * This file illustrates how to use the IJG code as a subroutine library
 * to read or write JPEG image files.  You should look at this code in
 * conjunction with the documentation file libjpeg.txt.
 *
 * This code will not do anything useful as-is, but it may be helpful as a
 * skeleton for constructing routines that call the JPEG library.
 *