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How do I determine k when using k-means clustering?

...nder Selb in Pattern Analysis and Applications vol. 2, p. 59-72, 1999. Finally, you can start with one cluster, then keep splitting clusters until the points assigned to each cluster have a Gaussian distribution. In "Learning the k in k-means" (NIPS 2003), Greg Hamerly and Charles Elkan show some ...
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Set value of hidden field in a form using jQuery's “.val()” doesn't work

... Andy, thanks for the quick response. I actually tried with the "#texens" first, and then with "#input:hidden#texens" and neither of them seemed to work. When I changed the input type in the form from "hidden" to "text", and "#input:hidden:texens" to "#input:text:tex...
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Quickly create large file on a Windows system

... Just want to check if this is a sparse file or does the file actually have data in it? – slolife Jun 2 '11 at 17:35 2 ...
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Fade/dissolve when changing UIImageView's image

... I also am setting my image after a SDWebImages callback that way, but for some reason in my CollectionViewCell the image of the first cell, is initially the one from the last visible cell if all my cells update. I guess it's some kind of caching the presentationLayer or so...
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Convert from enum ordinal to enum type

I've the enum type ReportTypeEnum that get passed between methods in all my classes but I then need to pass this on the URL so I use the ordinal method to get the int value. After I get it in my other JSP page, I need to convert it to back to an ReportTypeEnum so that I can continue passing it. ...
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What is the C runtime library?

What actually is a C runtime library and what is it used for? I was searching, Googling like a devil, but I couldn't find anything better than Microsoft's: "The Microsoft run-time library provides routines for programming for the Microsoft Windows operating system. These routines automate many commo...
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When should we use mutex and when should we use semaphore

... to sleep till you release the mutex. Spinlock: Use a spinlock when you really want to use a mutex but your thread is not allowed to sleep. e.g.: An interrupt handler within OS kernel must never sleep. If it does the system will freeze / crash. If you need to insert a node to globally shared linke...
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XPath to find elements that does not have an id or class

How can I get all tr elements without id attribute? 4 Answers 4 ...
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How do I “un-revert” a reverted Git commit?

... Please note this will remove all changes in working tree and index. Use git stash to save any changes you don't wan't to lose. – zpon Aug 30 '16 at 5:37 ...
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Is it possible to update a localized storyboard's strings?

... For me Option 1 replaced all already translated strings with English ones. I had to add the translation once again. – Mihail Velikov Mar 4 '15 at 9:24 ...