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Articles indexed Thursday April 1 2010

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  • Mobile Money

    A cellphone-based cash transfer system has changed the way Kenyans handle their finances Business - Financial services - Kenya - Money Transfers - Other Payment Systems

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  • Truly Random Numbers

    German researchers use a "flip-flop" to improve random number generator Random number generation - Algorithms - Pseudorandom Numbers - Math - Recreation

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  • Team Building Goes Viral

    Ready for an Agile development environment? Success depends on making sure everyone buys in Development environment - Business - Programming - Integrated development environment - Environment

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  • The one true domain model - a fallacy?

    - by James L
    I've just finished working for a client which has burnt millions on a project to come up with the 'one true domain model' for their business. This was the project's sole deliverable. What are your thoughts on this? Is a single version of the truth realistic?

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  • Cannot bind text field to selected item in JTable in NetBeans

    - by titaniumdecoy
    I am trying to use NetBeans to bind a JTextField to the selected element of a JTable. The JTable gets its data from an AbstractTableModel subclass which returns Cow objects. At present, each Cow object is displayed as a string through its toString method. The binding seems obvious but does not work; the bound value of the text field is always null. I bound the text property of the JTextField in NetBeans to: flowTable[${selectedElement.prefix}] This produces the following line of generated code: org.jdesktop.beansbinding.Binding binding = org.jdesktop.beansbinding.Bindings.createAutoBinding( org.jdesktop.beansbinding.AutoBinding.UpdateStrategy.READ_WRITE, flowTable, org.jdesktop.beansbinding.ELProperty.create("${selectedElement.prefix}"), courseNameTextField, org.jdesktop.beansbinding.BeanProperty.create("text")); What am I doing wrong?

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  • How to set tab stops after whitespaces in latex?

    - by humble coffee
    I'm trying to set tab stops in latex in the tabbing environment. My problem is that I want to set a tab stop after a number of whitespaces. The problem is that latex of course ignores multiple whitespaces, and it seems to only support setting tab stops after actual text. I'm trying to create something like this: A -> B CD -> A The problem is that the extra space after the 'A' is ignored for the purposes of setting the tab stop.

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  • Very slow guards in my monadic random implementation (haskell)

    - by danpriduha
    Hi! I was tried to write one random number generator implementation, based on number class. I also add there Monad and MonadPlus instance. What mean "MonadPlus" and why I add this instance? Because of I want to use guards like here: -- test.hs -- import RandomMonad import Control.Monad import System.Random x = Rand (randomR (1 ::Integer, 3)) ::Rand StdGen Integer y = do a <-x guard (a /=2) guard (a /=1) return a here comes RandomMonad.hs file contents: -- RandomMonad.hs -- module RandomMonad where import Control.Monad import System.Random import Data.List data RandomGen g => Rand g a = Rand (g ->(a,g)) | RandZero instance (Show g, RandomGen g) => Monad (Rand g) where return x = Rand (\g ->(x,g)) (RandZero)>>= _ = RandZero (Rand argTransformer)>>=(parametricRandom) = Rand funTransformer where funTransformer g | isZero x = funTransformer g1 | otherwise = (getRandom x g1,getGen x g1) where x = parametricRandom val (val,g1) = argTransformer g isZero RandZero = True isZero _ = False instance (Show g, RandomGen g) => MonadPlus (Rand g) where mzero = RandZero RandZero `mplus` x = x x `mplus` RandZero = x x `mplus` y = x getRandom :: RandomGen g => Rand g a ->g ->a getRandom (Rand f) g = (fst (f g)) getGen :: RandomGen g => Rand g a ->g -> g getGen (Rand f) g = snd (f g) when I run ghci interpreter, and give following command getRandom y (mkStdGen 2000000000) I can see memory overflow on my computer (1G). It's not expected, and if I delete one guard, it works very fast. Why in this case it works too slow? What I do wrong?

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  • Choosing Merge Direction

    - by tbreffni
    Consider a simple source-control layout, with a trunk representing a future release in development and a single branch representing a release currently in production. When a bug is discovered that needs fixed in both branches, should the change be made first to the trunk then merged down to the branch, or made first to the branch then merged up to the trunk? Typically I've made the fix first in the trunk then merged downwards, however there is an increased risk this way that future new features get merged down accidentally. What has worked best in your experience?

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