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

...rning the k in k-means" by Greg Hamerly, Charles Elkan. It uses a Gaussian test to determine the right number of clusters. Also, the authors claim that this method is better than BIC which is mentioned in the accepted answer. ...
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Chrome desktop notification example [closed]

...k in Chrome, and to learn the story of rich HTML notifications. Now the latest standard is at https://notifications.spec.whatwg.org/. As to why there are two different calls to the same effect, depending on whether you're in a service worker or not - see this ticket I filed while I worked at Googl...
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Installation error: INSTALL_PARSE_FAILED_MANIFEST_MALFORMED?

... name, you can also type the full name of the activity like : "com.example.test.Activity_Name", or ".Activity_Name" – Amt87 Sep 18 '12 at 7:40 add a comment ...
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How do I prevent Android taking a screenshot when my app goes to the background?

... Try FLAG_SECURE: public class FlagSecureTestActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, ...
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Angular js init ng-model from default values

...IW: I dislike variable assignment in template expressions because it's not testable. – Ben Lesh Jan 9 '15 at 17:17  |  show 6 more comments ...
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Best way to use multiple SSH private keys on one client

... ssh-add ~/.ssh/xxx_id_rsa Make sure you test it before adding with: ssh -i ~/.ssh/xxx_id_rsa username@example.com If you have any problems with errors sometimes changing the security of the file helps: chmod 0600 ~/.ssh/xxx_id_rsa ...
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When should I use Struct vs. OpenStruct?

... But you are aware that the OpenStruct test creates a lot temporary hashes. I suggest a slightly modified benchmark - which still supports your verdict (see below). – Robert Klemme Dec 16 '10 at 9:19 ...
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Compare JavaScript Array of Objects to Get Min / Max

... The fastest way, in this case, is looping through all elements, and compare it to the highest/lowest value, so far. (Creating an array, invoking array methods is overkill for this simple operation). // There's no real number bigg...
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Where can I learn jQuery? Is it worth it?

...ere like Wikipedia, select a few that fit your criteria and interest you. Test them out to see how they work for you. Most, if not all, of these libraries have websites w/ reference documentation and user group type support. To put some names out there, Prototype, script.aculo.us, Jquery, Dojo, Y...
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Generating random numbers in Objective-C

... i just tested random(), and it showed the same problem as rand() – LolaRun Feb 24 '12 at 17:42 ...