codergeek42

• 21:05 #christmas dinner: Veuve Clicquot opened with swords, Gratin Dauphinois, homemade christmas log, #family time, gifts!!! #

New Year's Resolutions: Assume Responsibility

Assume responsibility.
Play God.
Be God.
Create, judge, save.
Read and act and don't redact.
Write, save, revise, save, repeat.
Every word is a word of love for the future.
Every poem is a love poem for the future.
Every letter is a love letter to the future.
The end of the story was already written by you before you were born.
Time is strange.
The way is familiar.
See the lamp in the mirror.
Believe in the sun. Stare into the moon.
Think.
Reflect or die.
There are no forks in the road, but there are many twists and turns.
Whatever you are waiting for will come to you.
Whatever you truly seek, you have already found in the future.
You are the pen and the ink and the paper and the words and the reader and the reading and the meaning of the story and shelf in the library where they keep the book and all its sequels, and your name is its title and the subject, which is also who you are and how you feel and why you are exactly what and who and when and how you are as you are. And you are checked out to yourself and due right now, as you have requested yourself to be turned in and checked out to the future.

• 18:25 Saw "Taken" with my family last night. Pretty realistic #martialarts in there, or I should at least say #fighting. #

Holiday debuggery

We know there were a few kinks with the holiday promotion. We've been working very hard to get them ironed out. If you have a paid/permanent account, keep on sending those coupons. Here's an update:

• If you were unable to send out multiple coupons at a time, please perform a hard refresh, and you should be good to go.
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• If you tried to redeem a holiday coupon and had trouble using a gift certificate to cover the balance of an annual paid account, we identified the root problem. If this happened to you, you can now use your holiday coupon together with your gift certificate.
• If the number of holiday coupons you have available suddenly goes up (instead of down), this might be due to recipients declining the coupons, at which point your pool of available coupons will be replenished and, therefore, increase.
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Tweaks

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Give a little extra!

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Celebrate with holiday vGifts!

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Photos of the week

We're back with more dazzling pictures from around the world. Congrats to marlenemcc, who has been awarded a virtual blue ribbon as the winner of our fourth photo contest. We hope you'll click over to LJ_Photophile poll and tell us your picks in pics!

For more fantastic user content, we'll meet you under the cut. ( Read more... )

Curtains

Thanks, again, for reading. Here's wishing you the very merriest of holidays. We'll see you next year!

My bicycle was stolen earlier this evening. Sufficiently close to see the guy cycling away with it. Drove around a bit with Dave looking for it, but didn't find :-(

• Orange DeVinci St Tropez (large)
• Reward if you return it!
• Extensive scuff damage to the handlebar ends
• Panier Rack
• Rain fenders
• 2x front LED lights
• 2x rear LED lights
• Serial: SA…863

Last time I had my bike stolen I was in the downtown eastside. This time it was stolen from outside my house, NOT visible from the street or alley, around 23h00 at night.

Early Christmas came for this year in the form of an iPod touch. So far so good. Just a bit of music, tv shows and free games so far. Oh. And Internet. Lots of internet.

Posted via LiveJournal.app.

• 23:49 @republicofmath Re: Big-O. Does the constant matter? Convince me ;-) #
• 12:51 New post: Inter-array permutations in Ruby trevoke.net/blog/2009/12/17/inter-array-permutations-in-ruby/ #ruby #
• 13:50 New post: Random constrained permutations in Ruby trevoke.net/blog/2009/12/17/random-constrained-permutations-in-ruby/ #ruby #

Look, Ma, these are my baby steps in algorithms!

# list is the elements to be permuted
# y is the number of results desired
# z is the number of elements per result
# equalizer keeps track of who got used how many times
def constrained_permutations list, y, z
  list.uniq! # Never trust the user. We want no repetitions.
  equalizer = {}
  list.each { |element| equalizer[element] = 0 }

  results = []
  # Do this until we get as many results as desired
  while results.size < y
    pool = []
    puts pool
    least_used = equalizer.each_value.min
    # Find how used the least used element was
    while pool.size < z
      # Do this until we have enough elements in this resultset
      element = nil
      while element.nil?
        # If we run out of "least used elements", then we need to increment
        # our definition of "least used" by 1 and keep going.
        element = list.shuffle.find do |x|
          !pool.include?(x) && equalizer[x] == least_used
        end
        least_used += 1 if element.nil?
      end
      equalizer[element] += 1
      # This element has now been used one more time.
      pool << element
    end
    results << pool
  end
  return results
end

constrained_permutations [0,1,2,3,4,5,6], 6, 2
=> [[4, 0], [1, 3], [2, 5], [6, 0], [2, 5], [3, 6]]
constrained_permutations [0,1,2,3,4,5,6], 6, 2
=> [[4, 5], [6, 3], [0, 2], [1, 6], [5, 4], [3, 0]]

Send to:

Mirrored from Seven steps.

I don’t really have a better name for this. It’s also not completely clean, but it works. I had, almost a year ago (362 days ago), written a blog post about lexicographic permutations. That was about permutations of elements within one array.
Someone on ruby-forum asked about permutations between multiple arrays. I found something in C#, which I was happy to transcribe to Ruby and tweak a little.

def array_permutations array, index=0
  # index is 0 by default : start at the beginning, more elegant.
  return array[-1] if index == array.size - 1 # Return last element if at end.
  result = []
  array[index].each do |element| # For each array
    array_permutations(array, index + 1).each do |x| # Permute permute permute
      result << "#{element}, #{x}"
    end
  end
  return result
end

So, we get this:

first = ['one', 'two']
second = ['three', 'four']
third = 'five', 'six']
result = array_permutations [first, second, third]
=> ["one, three, five", "one, three, six", "one, four, five", "one, four, six", "two, three, five", "two, thre
e, six", "two, four, five", "two, four, six"]

Magic!

——
Edit – of course, my solution is hackish, and someone came up with a quicker and more elegant solution:

def fancy_array_permutation array
  return array[0] if array.size == 1
  first = array.shift
  return first.product( fancy_array_permutation(array) ).map {|x| x.flatten.join(" ")}
end

This gives the same result as above.

Send to:

Mirrored from Seven steps.

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Happy holiday promotion!

Tweaks and Enhancements

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You can view more awesome user content after the jump!

Curtains

Thanks, again, for joining us. Until next time, stay snug!