Monthly Archives: February 2012

種子論起點 11.0.1

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這段改編自 2010 年 3 月 20 日的對話。

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剛才我講的那個理論，我們應該為它，起一個名字，以防日後討論問題時，需要用到它。

其實，根據剛才的討論內容，這個理論本來，可以叫作「種子靈感天線搞 gag 間書太極謀事在人成事在天可遇不可求有心栽花花不香無心插柳柳成蔭踏破鐵鞋無覓處得來全不費功夫原理」。

但是，這個名字實在太長，不適宜日常的運用。如果不是那麼長，又很難可以完全準確地，捕捉到它的神髓。這就是困難所在。

（安：根據你這個理論本身，如果你刻意地，硬要立刻想出，一個好的名字，你反而不能如願。）

— Me@2010.03.21

— Me@2010.09.26

— Me@2012.02.20

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2012.02.20 Monday (c) All rights reserved by ACHK

Multinomial coefficient

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二項式係數 3.2 | Binomial coefficient 3.2

這段改編自 2010 年 5 月 25 日的對話。

假設要把 15 個蘋果分成 3 袋。第一袋有 3 個，第二袋有 2 個，而第三袋有 10 個。那樣，有多少個分配方法呢？

你可以用比「二項式係數」更先進的「多項式係數」（multinomial coefficient）去運算。「多項式係數」公式的結構，和「二項式係數」公式的結構一模一樣。即使你沒有刻意背誦，亦會很容易記得。

{15 \choose 3, 2, 10} =

(15!)
————- =
(3!)(2!)(10!)

30030

分子的「15!」代表總共有 15 個蘋果。分母有三個因子，代表要分成三袋。第一個因子是（3!)，代表第一袋要有 3 個蘋果。第二個因子是（2!)，代表第二袋要有兩個。第三個因子是（10!)，代表第三袋要有 10 個。

— Me@2012.02.19

2012.02.19 Sunday (c) All rights reserved by ACHK

Lisp macros 2.2

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I think one of the problems with Lisp is that it is too powerful. It has so much meta ability that it allows people to invent their own little worlds, and it takes a while to figure out each person’s little world (SoftwareGivesUsGodLikePowers).

— Lisp is Too Powerful

2012.02.19 Sunday ACHK

潛行凶間 2.2

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夢中多重自我

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.

A human mind is a fractal.

— Me@2010.08.02

2012.02.18 Saturday (c) All rights reserved by ACHK

龍珠 2.2

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種子意念 2.1.4 | 網誌時代 14.3

這段改編自 2010 年 3 月 20 日的對話。

「閱讀」會遇到類似的問題。以前年輕時，我會煩惱有太多書要閱讀。值得看的書實在有很多，不「全部」也閱讀的話，又好像有很大遺憾。每看少一本書，我就會損失一本書的知識和機遇。　

後來我發現，到了二十八歲左右，就開始沒有必要，去刻意閱讀一般的書籍。而我也再沒有那個動機。這個現象的原因是，閱讀越多，思考水平就會越高。相對於你來說，市面上書籍的水平就會降低。換句話說，閱讀越多，值得你看的書籍就會越少。

— Me@2012.02.18

2012.02.18 Saturday (c) All rights reserved by ACHK

二項式係數 3.1

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Binomial coefficient 3.1

這段改編自 2010 年 5 月 25 日的對話。

nCr 的數值代表，如果要從 n 件物件中選 r 件出來，有多少個可能性。例如，從 5 個蘋果中，選 3 個出來的話，有多少種選擇呢？答案是 5C3，即是「5 選 3」，等於 10。

nCr 的另一個詮釋是，如果要把 n 件物件分成兩組，一組有 r 件，而另一組有 (n – r) 件的話，有多少個可能性。例如，假設要把 5 個蘋果分成兩袋。一袋有 3 個，而另一袋有 2 個。那樣，有多少個分配方法呢？答案是 5C3，即是「5 選 3」，等於 10。

只要你把 5C3 的公式寫出來，「分成兩組」的意思會格外明顯。　

5C3 =

(5!)
——–
(3!)(2!)

分子的「5!」代表總共有 5 個蘋果。分母有兩個因子，代表要分成兩袋。第一個因子是（3!)，代表第一袋要有 3 個蘋果。第二個因子是（2!)，代表第二袋要有兩個。

在這個 nCr 的詮釋下，「 nCr = nC(n-r) 」的原因一目了然。

— Me@2012.02.17

2012.02.17 Friday (c) All rights reserved by ACHK

Hacker News

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Hacker News is a social news website about computer hacking and startup companies, run by Paul Graham’s funding firm Y Combinator. It is different from other social news websites in that there is no option to down vote submissions; submissions can either be voted up or not voted on at all. In contrast, comments can be down voted when a user accumulates sufficient “karma,” or points gained when submissions or comments are voted up. In general, content that can be submitted is defined as “anything that gratifies one’s intellectual curiosity”.

History

The site was created by Paul Graham in February 2007. Initially it was called Startup News or occasionally News.YC. On August 14, 2007 it became known by its current name. It developed as a project of his company Y Combinator, functioning as a real-world application of the Arc programming language which Graham co-developed.

The intention was to recreate a community similar to the early days of Reddit. Graham has stated he hopes to avoid the Eternal September that results in the general decline of intelligent discourse within a community.

— Wikipedia on Hacker News

2012.02.17 Friday ACHK

龍珠 2

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種子意念 2.1.3 | 網誌時代 14.2

這段改編自 2010 年 3 月 20 日的對話。

寫作時，我應有的心態是，即使企圖傳授個人的全部知識，我亦沒有必要，把全部東西也寫出來。其實，只要把核心的東西齊集，我就毋須再寫其他。讀者有了「知識完備集合」以後，就可以隨時隨地，透過當中的「知識基礎向量」，去建構新知識，解決自己的問題。

情形就好像學習英文字母。讀者一日未學懂全部二十六個英文字母，一日的英文都會一頭霧水。但是，只要掌握了全部字母，他就可以開始學習任何英文生字詞語，而毋須再花時間，去學習新的英文字母。

— Me@2012.02.16

Give a man a fish and you feed him for a day.

Teach him how to fish and you feed him for a lifetime.

—

2012.02.16 Thursday (c) All rights reserved by ACHK

Life hacking 4

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The term life hack refers to productivity tricks that computer programmers devise and employ to cut through information overload and organize their data. In more recent times, the same phrase has expanded to any sort of trick, shortcut, skill, or novelty method to increase productivity and efficiency, in all walks of life; in other words, anything that solves an everyday problem in a clever or non-obvious way might be called a life hack.

The original definition of the term hack is an inelegant but effective solution to a specific computing problem.

— Wikipedia on Life hack

2012.02.16 Thursday ACHK

Exploding Offer Season

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2. If you get an exploding offer from a company that’s not your first choice, push back. Say, “I’m sorry, I’m not going to be able to give you an answer until January 14th. I hope that’s OK.” Almost any company, when pressed, will give you a chance to compare offers. Don’t worry about burning bridges or pissing anyone off. Trust me on this one: there’s not a single hiring manager in the world who wants to hire you but would get mad just because you’re considering other offers. It actually works the other way. When they realize you’re in demand, they’ll want you more.

— Joel Spolsky

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2012.02.15 Wednesday ACHK

The Originals

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Powered by, 3 | 原創論 4 | 天人天書 5

       
    * Next to the originator of a good sentence is the first quoter of it.    
   
    * A great man quotes bravely, and will not draw on his invention when his memory serves him with a word just as good.

    * Genius borrows nobly. When Shakespeare is charged with debts to his authors, Landor replies: “Yet he was more original than his originals. He breathed upon dead bodies and brought them into life.”
   
— Ralph W. Emerson

2012.02.14 Tuesday ACHK