「コードをしたためる」ということは「プログラマー」という「職人」の「仕事」だと巷では認識されているようです。 その認識が誤りで、どう誤りで、誤った認識のままだと何がおこるのか。本講演がその認識を改めるきっかけとなれば幸いです。

1. Code Matters
@dankogai

2. What’s Code?

3. Dictionary says…
1.a system of words, letters,
figures, or other symbols
substituted for other words,
letters, etc., esp. for the
purposes of secrecy:
2. Computing program
instructions:
3.a systematic collection of laws
or regulations:

4. Dictionary says…
1.a system of words, letters,
figures, or other symbols
substituted for other words,
letters, etc., esp. for the
purposes of secrecy:
2. Computing program
instructions:
3.a systematic collection of laws
or regulations:

5. Dictionary says…
1.暗号
2.軟件
3.法律

6. What gives?
1.Not so easy to read.
2.Not only readable, but
executable.
3.Not always executed as
written.

7. An Example

8. A Pair of Cords of Code
• Decoded in 1953
•ATGC = 4 letters = 2 bits
• 3 bases = 1 codon = 6 bits
• 6 billion bases = 1.5 GBytes
• Micro SD card can hold 20 of
us (without compression :-)

9. Physics vs. Logics

10. Physics: conservation

11. Physics: conservation
•Mass + Energy
•Moment
•Angular Moment
•Electric Charges
•…

12. Physics: conservation
To give something, it must be taken from somewhere.

13. Logics: propagation

14. Logics: propagation
•Copying is easier than moving
•To move something, you first copy then delete the
original

15. Logics: propagation
•Copying is easier than moving
•To move something, you first copy then delete the
original
•What happens if you forget to delete the source?

16. Economics:
Physics or Logics?

17. Economics:
Physics or Logics?
•It’s Physics!
•If I give you a 10,000 yen, you have 10,000 yen more
and I have 10,000 yen

18. Economics:
Physics or Logics?
•It’s Logics!
•I just left 10,000 dollars in my bank account. It is
now 10,300 dollars. Where’s that 300 dollars come
from?

19. Economics:
Physics AND Logics
•It conserves spatially
•It propagates temporally
•It is an emulation of what we look, hear, and feels at
the reality

20. Our Reality
!= Physics

21. Our Reality
== Physics + Logics
•See how we design money
•Emulates physics, adjusted to our perception
•See how we design UI
•Emulates physics, adjusted to our perception

22. Adjusted to Perception
• A physically impossible
building
• Looks so real
• Why?

23. Physics + Logics
⇒ Real + Imaginary
Fundamental Theorem of
Algebra
• The field of complex numbers
is Algebraically closed
•You need not only real
numbers but also imaginary
numbers

24. Hardware:
Physical Economy
•Hardcoded
•Cost of production ∝ Number of Units
↓ Inventory required
↓ You have to repair the broken parts to fix it
↑ People are used to paying for it

25. Software:
Logical Economy
•(soft)coded
•The cost of single copy ≒ The cost of billion copies
↑ No Inventory required
↑You can fix the broken parts later
↓People are used to paying for it

26. Hardware + Software
= i + P*
• iPhone itself = Physical
• No one else but Samsung
can make 200 million of them
a year
• iOS = Logical
• Samsung has to import
Android to complete the
product

27. Reality changes
• Introduced in 2007
• "A Phone, an iPod, an
internet communicator"
• People are least impresssed
with "an internet
communicator"
• 7 years later
• who makes a phone call with
smart phones?

28. Reality changes
- but only slowly
• iOS is NOT quite logical
• Look and feel = physics
• > 90% of iOS is used up to
emulate physics
• But it is getting less physical
generation by generation
• iOS6 -> iOS7

29. Q. Why did Apple Make
iPhones Big?

30. Don’t bet against the
code

31. Don’t bet agains the code
• (Unless you are a scholar)
• When physics does not work,
think logics
• When logics does not work,
think physics
• Reality is complex, not real or
imaginary.

32. That’s it - for now
for q in questions {
q.answer()
}

33. Further Reading
小飼弾のコードなエッセイ
小飼弾
技術評論社
ISBN:978-4774156644