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“An easy game: Only paper and pencil needed. A game for one player.
And an open game: Will you improve one of the current world records???” -
“This article describes the R package DEoptim which implements the differential evolution algorithm for the global optimization of a real-valued function of a real-valued parameter vector. The implementation of differential evolution in DEoptim interfaces with C code for efficiency. The utility of the package is illustrated via case studies in fitting a Parratt model for X-ray reflectometry data and a Markov-Switching Generalized AutoRegressive Conditional Heteroskedasticity (MSGARCH) model for the returns of the Swiss Market Index.”
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“In plain terms, derivatives are THE cause of the Financial Crisis. They are behind EVERY failure/ default that has occurred thus far. The fact that virtually no one is willing to address this issue or include it in the discussion of how to insure we don’t have a Second Round of the Crisis only confirms the fact that no one has a clue how to resolve this situation.”
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“Then something bad happens. The new product shows its flaws. And precisely because no one really understands it, the market cracks. Investors all run away at once, as they don’t really have the tools to assess the situation. Where lack of knowledge about the product originally drove demand, now it accelerates flight.”
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“Of course, you could avoid all such troubles in the first place by not stealing GPL code to begin with. But if something happens inadvertently and some rogue employee sneaks some GPL code into your proprietary product, the sky isn’t falling. It’s a manageable risk and a solvable problem. No one wants to steal your code in retaliation or force it to be something you don’t want it to be. The GPL is unequivocally a license, and that’s the truth.”
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“Presumably, this isn’t the book the libertarians have read, so I assume there must exist another of the same title.”
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“At the end of the day, the most pressing problems of modern life require an accurate description of the real world so that the inevitable tradeoffs can be managed for the common good. Fundamentalism interferes with this enterprise and needs to be recognized for what it is. Fortunately, we can go beyond epithets and prove that a given belief system counts as fundamentalist by calling attention to the absence of tradeoffs. Market fundamentalism can be as plain as the nose on your face when you know what to look for.”
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“Helpers suck. They’ve always sucked, and they will suck on if we keep them in modules.
ActiveHelper is an attempt to pack helpers into classes. This brings us a few benefits
inheritance helpers can be derived other helpers
delegation helpers are no longer mixed into a target– the targets use the helper, where the new
methods are delegated to the helper instances
proper encapsulation helpers don’t rely blindly on instance variables – a helper defines its needs, the target has to provide readers
interfaces a helper clearly provides methods and might use additional helpers
Note that ActiveHelper is a generic helper framework. Not coupled to anything like Rails or Merb. Not providing any concrete helpers. Feel free to use clean helpers in any framework (including Rails and friends)!” -
“…Being on fire, you would probably apply powerful pails of water to put it out, and send off your man for the engines? You would do very wrong.…”
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“This article is an excerpt from Chapter 13, “Encrypting and Securely Deleting Files,” reprinted with the kind permission of Wiley. File encryption is of course just one tiny piece of the security puzzle, but it’s worth knowing about if you keep confidential data on your Mac, especially if the computer is ever out of your physical control — which would include being lost or stolen.”
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“What’s striking about the contrast between the Texas story and Georgia’s debacle is that it doesn’t seem to have anything to do with the issues that have dominated debates about banking reform. For example, many observers have blamed complex financial derivatives for the crisis. But Georgia banks blew themselves up with old-fashioned loans gone bad.”
links for 2010-04-12
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