CF2014 - Code Matters

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

CF2014 - Code Matters

by dankogai

on Oct 07, 2014

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CF2014 - Code Matters Presentation Transcript