Code Matters@dankogai

What’s Code?

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:

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:

Dictionary says…1.暗号

2.軟件

3.法律

What gives?1.Not so easy to read.

2.Not only readable, but executable.

3.Not always executed as written.

An Example

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 :-)

Physics vs. Logics

Physics: conservation

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

Physics: conservationTo give something, it must be taken from somewhere.

Logics: propagation

Logics: propagation•Copying is easier than moving

•To move something, you first copy then delete the original

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?

Economics: Physics or Logics?

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

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?

Economics: Physics AND Logics

•It conserves spatially •It propagates temporally •It is an emulation of what we look, hear, and feels at

the reality

Our Reality != Physics

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

Adjusted to Perception• A physically impossible

building

• Looks so real

• Why?

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

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

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

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

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?

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

Q. Why did Apple Make iPhones Big?

Don’t bet against the code

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.

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

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