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Why doesn't Dijkstra's algorithm work for negative weight edges?

... A / \ / \ / \ 5 2 / \ B--(-10)-->C V={A,B,C} ; E = {(A,C,2), (A,B,5), (B,C,-10)} Dijkstra from A will first develop C, and will later fail to find A->B->C EDIT a bit deeper explanation: Note that this is important, because in each relaxa...
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filter for complete cases in data.frame using dplyr (case-wise deletion)

... answer! – infominer Mar 12 '14 at 20:09 1 Thanks! I added some benchmark results. na.omit() perf...
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What approaches are available to dummy design-time data in WPF?

I am working without expression blend and just using the XAML editor in vs2010. The wisdom of this aside, I am increasingly seeing a need for design-time data binding. For simple cases, the FallbackValue property works very nicely (Textboxes and TextBlocks, etc). But especially when dealing with ...
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Best design for a changelog / auditing database table? [closed]

... 70 In the project I'm working on, audit log also started from the very minimalistic design, like th...
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How to force a web browser NOT to cache images

... answered Sep 24 '08 at 12:27 epochwolfepochwolf 11.3k1313 gold badges5555 silver badges6868 bronze badges ...
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R cannot be resolved - Android error

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Why am I not getting a java.util.ConcurrentModificationException in this example?

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How can I remove the string “\n” from within a Ruby string?

... | edited Jul 30 '12 at 0:19 answered Nov 16 '10 at 2:53 ...
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How to get root view controller?

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How to output something in PowerShell

... 200 Simply outputting something is PowerShell is a thing of beauty - and one its greatest strengths...