Hacker News Reader

jbpon Melvin Capital Lost 53% in January, Hurt by GameStop and Other Bets

I understand basic options. They listed only long puts in 13F, the max they could lose is the premium they paid. So there must be some other securities that they didn't disclose (mostly short calls as @tchanglington mentioned) which resulted in the loss. I was asking if hedgefunds can disclose selectively? If so that can be exploited in so many ways.

jbpon Melvin Capital Lost 53% in January, Hurt by GameStop and Other Bets

Thank you. But those short calls are not in 13F, so they can selectively disclose?

jbpon Melvin Capital Lost 53% in January, Hurt by GameStop and Other Bets

How could they lose $7B?

Melvin Capital Recent 13F : https://sec.report/Document/0000905718-20-001111/

It shows they had about $757mm worth puts. Assuming all of that puts are worth zero, their max loss will be $757mm. GME loss would be $55mm.

Hedgefunds don't have to disclose everything? Just trying to understand how did they lose that much.

jbpon Personal Wiki for Vim

Try Spacemacs, default vi bindings

jbpon U.S. Congress Renews $5M Open Textbook Pilot for Second Year

List by a Math professor: http://people.math.gatech.edu/%7Ecain/textbooks/onlinebooks....

jbpon Nassim Taleb, Absorbent Barriers and House Money

Don't know about 18th century, but some what similar strategy is already mentioned by Taleb in the interview: Kelly Criterion.

jbpon Pentagon Has No Idea Where $800M Went

I agree, but why is U.S. subsidizing the whole world without getting as much benefit? Its not just this, U.S. is subsidizing the whole world's healthcare costs too.

jbpon Facebook is the new AOL

One more reason I do sometimes this because I remember the website but don't quite remember the domain (was it .com or .net or .org)

jbpon The Raft Consensus Algorithm

PAXOS is very complicated, Raft is direct response to it by simplifying the consensus algorithm. From the article:

  "It's equivalent to Paxos in fault-tolerance and performance. The difference is that it's decomposed into relatively independent subproblems, and it cleanly addresses all major pieces needed for practical systems."

One of the authors of Raft is Prof. John Ousterhout(TCL creator, among other things)

jbpon Put Yourself Out There: The Myth of the Genius Programmer

I think it is not just about "need for influence".

To learn somthing, is to 1. Read, 2. Do and 3. Teach. So blogging can be "teach" part.

jbpon Monthly revenue breakdown of PlentyOfFish's early days

>>web-scale word-of-mouth(social networks, product review sites, recommendations from field- or topic-specific authoritative websites)

All of which are ad-supported and if they were fee-based they wouldn't be that massive, which agian brings back to ads.

>> Relying on ad revenue is a moral failing.

If relying on ad revenue is a moral failing, so is using such a product/service. Have never used a such product/service?

jbpon How many 32-bit RISC CPUs fit in an FPGA? Now vs. 1995?

I also had to implement simple microprocessor on an FPGA about 10 years ago.

I think one of the main reason is programming the FPGA is not easy, the tools needed for FPGA development are all proprietary. Every FPGA has different way to program it.

jbpon The Command Line Crash Course

I use pushd/popd/dirs for multiples. I have aliases like p1 for "pushd +1" and so on.

jbpon Ex-Napster exec fatally struck by sheriff's patrol car while biking

Bike lanes by Casey Neistat : http://www.youtube.com/watch?v=bzE-IMaegzQ

jbpon How RethinkDB Works – 7pm tonight at SF Data Engineering

More information on what cperciva is saying (from Daniel Abadi)

http://dbmsmusings.blogspot.com/2012/10/ieee-computer-issue-...

Quoting from the post:

     "my past criticism of CAP not actually being about picking two of three out 
      of C (consistency), A (availability), and P (partition tolerance) due to the 
      fact  that it does not make sense to reason about a system that is ‘CA’. (If 
      there is no partition, any system can be both consistent and available ---  
      the only question is what happens when there is a partition --- does 
      consistency or availability get sacrificed?)"

jbpon Samsung faces sanctions over leak of confidential Apple documents

Not at all, atleast about Samsung. I would go ahead say that Samsung is the most unethical[1] company. Wikipedia list is only tip of the iceberg, that company's history is littered with unethical[2] behavior.

1. http://en.wikipedia.org/wiki/Samsung#Controversies 2. http://www.theverge.com/2012/11/30/3709688/samsung-25-years-...

jbpon Judge sentences Bradley Manning to 35 years

Huh? BS. I come here to HN to grok the truth, to see other side, not to nod head in agreement. I learn so much from rayiner's view point. I don't agree with him on all points, but I'm definitely a better informed person because of his reasoning.

jbpon The next Silicon Valley is probably going to be Silicon Valley

Is Harvard/MIT/BU for Boston any less? I think in addition to great universities, there is definitely something else to SV.

jbpon Paul Graham reviews Structure and Interpretation of Computer Programs (2000)

Also if you use emacs and el-get, there is a sicp package.

jbpon I'm learning to code by building 180 websites in 180 days. Today is day 115

This kind of dedication is inspiring.

From http://blog.jenniferdewalt.com/post/51616616313/day-58-explo... :

"Tomorrow I head to Pennsylvania to host a bridal shower and bachelorette weekend for my sister. Between the pre-wedding festivities and visiting with family, I’m going to be pretty limited on time for building websites. But, the show must go on and I am excited to see what kind of goodness I can create under pressure."

Congratulations Jennifer.

jbpon Mocl – a Common Lisp implementation for mobile platforms

Is this same as Gambit-c or Chicken scheme, but for CL?

jbpon Notational Velocity

And Org-mode

jbpon Google to Microsoft: Remove your YouTube App from the Windows Phone Store

Doesn't Microsoft do samething to Goolge though?

jbpon Go Circuit – Distributed Go Programming Framework

It looks like at this time Spawn doesn't support the closures yet. http://www.gocircuit.org/lang.html#worker-functions: "The need for boilerplate will be removed in an upcoming Circuit Compiler"

From https://github.com/tumblr/gocircuit/blob/master/src/circuit/...: "The worker function fn, whose type must have previously been registered with RegisterFunc"

And it looks like only function type id is communicated to worker: https://github.com/tumblr/gocircuit/blob/master/src/circuit/...

jbpon Go Circuit – Distributed Go Programming Framework

http://www.gocircuit.org/spawn.html

jbpon Unix tricks

As an emacs user I map "C-p" "C-n" for history search in bash

In .inputrc

  "\C-p": history-search-backward
  "\C-n": history-search-forward

Also I found the following settings to be very useful:

  # List the possible completions when Tab is pressed
  set show-all-if-ambiguous on
  #tab complete without needing to get the case right
  set completion-ignore-case on

jbpon C++ Grandmaster Certification Programming Assignment 1

Look at http://www.cppgm.org/news.html:

2013-02-22: 10,000 enrolled. Programming Assignment 1 Posted. Enrollments Extended:

They also have a time machine.

jbpon Good sleep, good learning, good life

Thats surprising, here in US, atleast at Kaiser hopital highly recommend breast feeding, and they offer lots of free support/classes. And surprisingly they don't recommend cosleeping.